What Pre-1978 Homes, a 534,000-Line Water Inventory, and the EPA’s Tighter Standards Mean for Harris County Property Owners

Houston has more lead exposure risk than most people assume, and the regulatory ground is shifting under property owners’ feet. The median year built for buildings inside the City of Houston is 1970, which puts a significant share of the housing stock squarely inside the pre-1978 lead-based paint window. The city’s Lead Service Line Inventory covers 534,165 connections, and the material of roughly 448,000 of them is still unknown. The EPA tightened its dust-lead rules in late 2024, with full enforcement of the new clearance levels arriving in January 2026. If you own, rent, renovate, sell, or insure property in Harris County, those three facts combine into a straightforward conclusion: lead testing is no longer a box to check at closing. It is the foundation for every decision that follows.

This guide explains what lead testing covers in Houston, how the rules differ from those in Dallas and Austin, who needs to be certified to perform the work, and why testing and remediation belong in separate hands. AirMD is an independent environmental testing firm. We test. We do not remediate. That separation matters, and the sections below explain why.

Real Questions Houston Property Owners Are Asking About Lead

Why does Houston have a lead problem in 2026 when lead paint was banned almost 50 years ago?

The ban on residential lead-based paint took effect in 1978. Every home, duplex, apartment building, daycare, and commercial structure built before that year is presumed under federal law to contain lead-based paint unless testing proves otherwise. Research from the Kinder Institute for Urban Research at Rice University places the median year built for City of Houston buildings at 1970. The median for Harris County is 1981, which means Houston proper skews considerably older than its surrounding county. That older core includes the Heights, Montrose, Third Ward, East End, Independence Heights, Braeswood, Meyerland, Bellaire, and much of the inner Loop. These neighborhoods are also where renovation activity is heaviest, which is where lead hazards become active exposures instead of dormant ones.

Is there lead in Houston’s drinking water?

Houston’s treated water leaves the plant meeting federal standards, but the water that reaches a household tap has traveled through pipes the utility does not fully control. Under the EPA’s Lead and Copper Rule Revisions, Houston Public Works conducted an inventory of every drinking water service line in its distribution system. The results published before the October 2024 federal deadline showed 534,165 total service lines across the city’s six water distribution systems. Of those, 447,955 lines have unknown material on either the city-owned or the customer-owned side, or both. Houston Public Works had confirmed the materials of 86,210 pipes at the time of that report. Any line installed before Texas banned lead in service lines in June 1988 is treated as “lead status unknown” until records or physical inspection prove otherwise. The city is sending physical mail notices to hundreds of thousands of residents and asking customers to self-report their service line material where possible. The EPA has given utilities ten years to replace any lead pipes identified during the inventory.

What did the EPA change about lead testing in 2024?

In October 2024, the EPA finalized a rule that rewrote how lead-based paint hazards are identified and cleaned up in pre-1978 homes and childcare facilities. Three changes matter most. First, the dust-lead hazard standard was lowered to any reportable level detected by an EPA-recognized laboratory. There is no longer a numeric floor below which dust lead is considered safe for risk assessment purposes. Second, the dust-lead clearance levels (now called action levels) after an abatement were reduced. Floors dropped from 10 to 5 micrograms per square foot. Window sills dropped from 100 to 40 micrograms per square foot. Window troughs dropped from 400 to 100 micrograms per square foot. Third, the EPA lowered its residential soil-lead screening level from 400 parts per million to 200 parts per million, with a 100 ppm trigger in properties with multiple lead sources. The rule took effect January 13, 2025, with a grace period running through January 11, 2026, after which full compliance is required. Property owners, contractors, risk assessors, and lead firms working in Houston need to understand that the goalposts have moved, and moved substantially.

Standard	Previous Threshold	2024/2025 Threshold
Dust-lead hazard on floors	10 µg/ft²	Any reportable level
Dust-lead hazard on window sills	100 µg/ft²	Any reportable level
Post-abatement action level: floors	10 µg/ft²	5 µg/ft²
Post-abatement action level: window sills	100 µg/ft²	40 µg/ft²
Post-abatement action level: window troughs	400 µg/ft²	100 µg/ft²
Residential soil-lead screening level	400 ppm	200 ppm (100 ppm multi-source)
Full compliance deadline	N/A	January 12, 2026

How many Houston children are affected by lead exposure?

The Texas Department of State Health Services reported that in 2022, 790 children under the age of six in Harris County were identified with blood lead levels at or above 5 micrograms per deciliter. That figure uses the CDC’s older reference value. On January 1, 2023, Texas DSHS adopted the CDC’s current blood lead reference value of 3.5 micrograms per deciliter, which means a larger number of children now fall into the “follow-up required” category than under the old threshold. The Houston Health Department’s Childhood Lead Poisoning Prevention Program focuses testing resources on 16 high-risk zip codes defined by three criteria: at least 25 percent of households below poverty level, at least 20 percent of residences built before 1950, and historical data showing at least 10 percent of tested children in the area had elevated blood lead levels. Those zip codes include 77002, 77003, 77004, 77005, 77006, 77007, 77008, 77009, 77011, 77012, 77019, 77020, 77023, 77026, 77030, and 77098. If you own property, manage a rental, or renovate in any of those zip codes, professional lead testing is not optional risk management. It is baseline due diligence.

Do Dallas and Austin have the same lead problem as Houston?

Dallas shares most of Houston’s profile. Oak Cliff, Deep Ellum, East Dallas, Lakewood, Highland Park, and University Park are dense with pre-1978 homes. The same federal Renovation, Repair, and Painting Rule applies. The same Texas DSHS certification requirements apply. The same EPA Region 6 office (located in Dallas) enforces violations across both cities. Austin is the outlier among the three. National housing-stock data puts Austin’s median home age at roughly 19 years, one of the lowest in the country, because Austin added enormous volumes of new construction during the last two decades. The risk profile shifts accordingly. Austin’s pre-1978 stock concentrates in specific older neighborhoods like East Austin, Hyde Park, Clarksville, Tarrytown, and Central Austin, while the sprawling suburbs of Round Rock, Cedar Park, and Pflugerville are largely post-ban construction. Houston’s risk is broader and more distributed. Austin’s risk is narrower and more localized. Dallas lands between the two.

Factor	Houston	Dallas	Austin
Median building year (city proper)	1970	Similar to Houston	~2007 (median home age ~19 yrs)
Primary risk distribution	Broad, Inner Loop-heavy	Moderate, historic neighborhoods	Narrow, concentrated pockets
Older-stock neighborhoods	Heights, Montrose, Third Ward, East End	Oak Cliff, Deep Ellum, East Dallas, Lakewood	East Austin, Hyde Park, Clarksville, Tarrytown
Industrial-legacy soil contamination	Significant (Ship Channel, petrochemical corridor)	Moderate (Trinity River corridor)	Minimal
Governing lead-paint regulations	Federal RRP + TELRR	Federal RRP + TELRR	Federal RRP + TELRR
Enforcement region	EPA Region 6 (Dallas)	EPA Region 6 (Dallas)	EPA Region 6 (Dallas)

Who is legally authorized to perform lead testing in Texas?

Texas regulates lead-based paint activities under the Texas Environmental Lead Reduction Rules, administered by the Environmental Lead Program at the Texas Department of State Health Services. The rules apply to target housing (defined as housing built before January 1, 1978) and to child-occupied facilities built before that date. Six certifications exist under the rules: Lead Inspector, Lead Risk Assessor, Lead Abatement Supervisor, Lead Abatement Worker, Lead Abatement Project Designer, and Lead Firm. A lead inspection in target housing or a child-occupied facility must be conducted by a certified Lead Inspector or Risk Assessor. Samples must be analyzed by an EPA-recognized laboratory. Texas received EPA authorization to run its own lead-based paint training and certification program in 1999, so the state program operates in parallel with federal oversight. For renovation, repair, and painting work, the EPA administers the federal RRP Rule directly in Texas, which means renovators must hold EPA certification rather than state certification.

What happens if a contractor skips lead testing on a pre-1978 Houston property?

The EPA’s RRP Rule requires certified firms and certified renovators to follow lead-safe work practices whenever renovation, repair, or painting activities disturb more than six square feet of interior painted surface per room or more than twenty square feet of exterior painted surface in pre-1978 structures. Civil penalties run up to $37,500 per day per violation under the Toxic Substances Control Act, and the statutory maximum is adjusted annually for inflation. Criminal penalties are possible when a violation is knowing or willful, and can include fines up to $50,000 per day and imprisonment. Enforcement is not theoretical. The EPA and the Department of Justice announced a nationwide settlement with Lowe’s Home Centers in late 2025 for $12.5 million to resolve RRP violations stemming from work performed by Lowe’s contractors at hundreds of homes. Individual contractors have been sentenced to federal prison time for knowing violations. The financial risk to an uncertified contractor is concentrated in daily-multiplied penalties, business license suspension, insurance denial, and civil liability if a child develops lead poisoning traceable to the work.

Can I test for lead myself using a hardware-store kit?

Consumer test kits can confirm the presence of lead in a specific spot of paint, but they cannot replace a certified lead inspection or risk assessment for three reasons. First, a professional inspection documents the specific components tested, the locations, the sampling method, the lab analysis, and the results in a format that satisfies federal recordkeeping requirements, insurance carriers, real estate transaction disclosure rules, and regulatory audits. A consumer kit does not. Second, the 2024 EPA rule shifted dust-lead determinations to laboratory analysis by EPA-recognized laboratories. Consumer kits do not meet that standard. Third, an inspection by a certified Lead Inspector or Risk Assessor identifies not just whether lead is present, but where the hazard is active, which components pose the greatest exposure risk, and what the condition of the paint is. A consumer kit answers one small question in one small spot. A professional inspection answers the set of questions that determine what has to happen next.

When should soil lead testing be added to a Houston property assessment?

Three situations warrant soil testing in Houston. First, when a pre-1978 structure has a history of exterior paint deterioration, paint chips and lead dust accumulate in the soil around the dripline of the building. Federal regulation defines a soil-lead hazard as bare soil containing 400 ppm or more of lead in a play area, or an average of 1,200 ppm in the rest of the yard, although the EPA’s 2024 screening-level update reduced the residential screening threshold to 200 ppm (and 100 ppm where multiple sources of lead exist). Second, properties near major roadways, the Houston Ship Channel, industrial corridors, or former industrial sites can have soil contamination from leaded-gasoline deposition and legacy industrial activity. Third, if a child in the household has tested with an elevated blood lead level and the paint and water sources have already been screened, soil is the next logical exposure pathway to investigate.

What does a Houston lead inspection actually involve?

A full lead inspection on a single-family home typically includes three components. First, a visual assessment of the property with documentation of every painted component, its condition, and its accessibility to children. Second, sampling of painted surfaces using either XRF (x-ray fluorescence) analysis on site or paint-chip collection sent to an EPA-recognized laboratory, plus dust-wipe sampling of floors, window sills, and window troughs, and soil sampling where conditions warrant. Third, a written report that identifies every component tested, the method used, the specific location, the laboratory results, and the status of each component relative to the federal hazard and clearance standards. The report is the deliverable that satisfies the RRP Rule’s recordkeeping requirement, supports real estate disclosure, and documents regulatory compliance. The report follows the sampling. The sampling follows the inspection. The inspection follows a clear understanding of what the property needs and what the property owner intends to do with the information.

Houston’s Lead Exposure Sources: Why Testing Needs to Cover More Than Paint

Lead exposure in a Houston home rarely comes from a single source. Testing only the paint leaves real hazards undetected. The three pathways that matter for Harris County properties are paint and the dust it produces, drinking water delivered through older service lines and interior plumbing, and soil contaminated by deteriorated exterior paint or legacy industrial activity.

Paint and the Dust It Produces

The 1978 federal ban eliminated residential lead-based paint going forward, but it did nothing about the lead paint already on walls, windows, doors, trim, cabinetry, and exterior surfaces of older homes. Houston’s humid subtropical climate accelerates paint deterioration. Window friction surfaces generate lead dust every time a sash is raised or lowered. Door jambs generate dust every time a door is swung. Exterior paint chalks and weathers, releasing particles into soil where children play. The 2024 EPA rule recognized that the old numerical hazard thresholds were understating the risk. The new “any reportable level” standard for dust-lead hazards means that the science, not a fixed numerical cutoff, now determines whether a hazard is present. Testing is the only way to know which components are the source, what the exposure pathway looks like, and what needs to happen next.

Water Delivered Through Service Lines of Unknown Material

The Houston Public Works inventory is the single most important lead data point to emerge in the city in the past decade. Of 534,165 total service lines, roughly 84 percent have unknown material on at least one side. The utility does not know what material the pipe is made of, the customer does not know, and the records that might have answered the question were lost during the transition from paper to digital archives or never existed in the first place. A service line installed before the June 1988 Texas ban is presumed unknown until proven otherwise. For individual property owners, the practical question is straightforward: what is the pipe connecting your home to the main made of, and what is the interior plumbing made of? Lead solder in copper plumbing installed before 1986 is another pathway. Testing the water at the tap, after representative flush conditions, is the only way to confirm whether lead is actually leaching into drinking water at the point of use.

Soil Around Pre-1978 Structures and Near Industrial Corridors

Houston’s industrial history matters for soil-lead risk. The city sits at the center of the nation’s largest petrochemical complex. The Houston Ship Channel, East End refineries, and historical manufacturing zones deposited lead into surrounding soil through decades of air emissions before leaded gasoline was phased out. Properties near major roadways that carried heavy traffic during the leaded-gasoline era also have elevated soil lead. Exterior paint weathering around pre-1978 homes deposits lead in the dripline soil where children often play. The 2024 EPA screening-level reduction from 400 ppm to 200 ppm means soil that was considered borderline a few years ago may now exceed the threshold. Families with young children, daycares, and any property where children play in the yard should include a soil-lead component in the assessment, not only the paint.

How Houston Compares to Dallas and Austin

Property owners with assets in multiple Texas metros benefit from understanding how the risk and regulatory profiles differ. The three cities share the federal RRP framework, the Texas DSHS certification structure, and the same EPA Region 6 enforcement. They differ sharply in building-stock age and in the concentration of high-risk neighborhoods.

Dallas: A Peer Profile

Dallas and Houston mirror each other on most lead-related risk factors. Both have substantial pre-1978 housing inventories concentrated in historic neighborhoods. Oak Cliff, Deep Ellum, East Dallas, Lakewood, Highland Park, and University Park are dense with older homes. Dallas contractors face the same RRP penalties, follow the same Texas DSHS certification process, and work under the same EPA oversight as Houston contractors. Neighborhood revitalization is intense across Dallas County, which means renovation activity in pre-1978 housing is high. The practical testing protocol in Dallas looks almost identical to the Houston protocol. The regulatory obligations are identical. AirMD’s certified lead testing services in Dallas cover the full metro and surrounding Dallas County communities including Plano, Richardson, Garland, Irving, and Mesquite.

Austin: The Contrast Case

Austin’s median home age is among the lowest in the country, at roughly 19 years according to recent national housing-stock analysis. The city’s post-2000 construction boom dominates the inventory. The practical result is a narrower, more geographically concentrated lead risk. Pre-1978 homes cluster in specific neighborhoods: East Austin, Hyde Park, Clarksville, Tarrytown, South Austin, and parts of Central Austin. Rapid renovation activity in these specific neighborhoods drives the RRP compliance issues. Meanwhile, the suburban ring of Round Rock, Cedar Park, Pflugerville, and Leander is largely post-ban construction and carries little lead-paint risk. Austin contractors who work exclusively in newer construction rarely encounter RRP obligations. Austin contractors who specialize in restoring older central-city homes encounter them constantly. AirMD’s Austin lead testing services cover Travis County, Williamson County, and Hays County, with the work concentrated in the city’s older cores.

Houston: The Broadest Exposure of the Three

Houston combines the widest pre-1978 housing inventory of the three major metros, the most documented water service line uncertainty, and a significant industrial legacy that contributes to soil contamination. The 16 high-risk zip codes identified by the Houston Health Department overlap with the areas experiencing the heaviest renovation and real estate activity, which is precisely where lead disturbance produces active exposure. Property owners in Sugar Land, Pearland, The Woodlands, Katy, and Kingwood generally own newer stock but are not exempt: pockets of older construction exist even in the suburbs, and any pre-1978 component triggers the same federal obligations. A Houston portfolio owner needs a testing plan that covers paint, water, and soil across pre-1978 holdings and that documents the results in a form that insurance, lenders, and regulators will accept.

The 2024 EPA Rule: What Changed and What It Means for Houston

The October 2024 EPA rule, which took effect January 13, 2025, with full compliance required by January 11, 2026, is the most significant shift in lead-based paint regulation in more than a decade. Three changes have direct consequences for anyone commissioning lead testing in Houston.

Dust-Lead Hazard Standard: Any Reportable Level

Under the previous rule, dust-lead hazards on floors were identified at 10 micrograms per square foot or higher and on window sills at 100 micrograms per square foot or higher. The new rule replaces those numerical thresholds with “any reportable level” as determined by an EPA-recognized laboratory. The EPA’s rationale, supported by the 2024 Integrated Science Assessment for lead, is that the body of epidemiological evidence provides no threshold below which lead in dust is safe for children. Risk assessors in Houston now identify a dust-lead hazard whenever a qualifying laboratory reports a specific, non-zero lead loading on a sampled surface. This changes the dispositive question for property owners from “is the lead loading above the threshold?” to “did the laboratory detect lead?”

Dust-Lead Action Levels (Post-Abatement Clearance): 5 / 40 / 100

After abatement work, post-abatement clearance levels (now called action levels) were reduced from the previous 10, 100, and 400 micrograms per square foot for floors, window sills, and window troughs to 5, 40, and 100 micrograms per square foot respectively. For contractors performing abatement and for owners overseeing the work, this means tighter cleaning, more thorough documentation, and clearance testing that must demonstrate lower residual dust-lead levels than the rule previously required. Independent clearance testing by an entity that did not perform the abatement is the proper way to document that the new levels have been met.

Residential Soil Screening Level: 200 ppm

The EPA lowered its residential soil-lead screening level from 400 parts per million to 200 parts per million, with a 100 ppm trigger in properties with multiple sources of lead exposure. For Houston, where industrial legacy, former roadway lead deposition, and exterior paint weathering have seeded soil with lead across broad portions of the city, the lower screening level pulls a much larger set of properties into the “further investigation warranted” category than the prior threshold did. Soil testing is now more likely to produce actionable findings, and those findings are more likely to direct follow-up work.

Why AirMD Tests but Does Not Remediate

AirMD has been an independent environmental testing company since 2007. We perform inspections, collect samples, analyze results, and produce reports that document what is present, where, in what quantity, and in what condition. We do not perform lead abatement, paint removal, plumbing replacement, or soil remediation. That separation is deliberate, and it matters for one practical reason: the firm that identifies a hazard has no financial incentive to find work that should not be done, to specify scope beyond what the condition requires, or to under-report in order to minimize a subsequent cleanup bill. The inspection report exists to tell the property owner exactly what is there, nothing more and nothing less.

The separation also improves the report’s standing in downstream contexts. When AirMD’s findings go to an insurance carrier, a lender, a buyer’s or seller’s counsel, or an EPA compliance file, the independence of the testing firm is recognized and weighted accordingly. When the same firm both identifies and cleans up a hazard, that integrated arrangement produces results that are harder to defend in an adversarial context. Independent testing, followed by an independent remediation contractor selected by the property owner, produces a paper trail that withstands scrutiny. That structure is how AirMD approaches every Houston engagement.

When to Commission Lead Testing in Houston

Five situations should prompt a Houston property owner to commission professional lead testing. The trigger, the regulatory basis, and the specific action each one requires are summarized below.

Trigger	Regulatory Basis	What Testing Documents
Pre-renovation on pre-1978 structure (>6 sq ft interior or >20 sq ft exterior disturbance)	EPA RRP Rule	Whether lead-safe work practices are required; scope of containment; certified-renovator obligations
Sale or lease of pre-1978 property	Residential Lead-Based Paint Hazard Reduction Act, Section 1018	Known lead-based paint and hazards for mandatory disclosure; protection against post-sale liability
Child in household with elevated blood lead level	Texas DSHS environmental investigation protocol	Exposure source: paint, dust, water, soil, or other; supports medical case management
Property flagged “unknown” or “lead” in Houston Public Works inventory	EPA Lead and Copper Rule Revisions	Actual service line material; water lead levels at the tap; basis for replacement decision
Rental housing built before 1978 (especially in 16 high-risk zip codes)	HUD Lead-Safe Housing Rule; tenant safety; insurance requirements	Compliance baseline; reduces fair-housing and liability exposure

Frequently Asked Questions

Is lead-based paint banned in all homes?

Residential lead-based paint was banned in 1978. Homes built before that year are presumed to contain lead-based paint unless testing demonstrates otherwise.

What is the federal “RRP Rule”?

The EPA’s Renovation, Repair, and Painting Rule requires certified firms and certified renovators to follow lead-safe work practices whenever renovation activities disturb more than six square feet of interior or twenty square feet of exterior painted surface in pre-1978 housing or child-occupied facilities.

What are Houston’s 16 high-risk lead zip codes?

77002, 77003, 77004, 77005, 77006, 77007, 77008, 77009, 77011, 77012, 77019, 77020, 77023, 77026, 77030, and 77098, as identified by the Houston Health Department based on poverty, pre-1950 housing density, and historical blood lead testing data.

What is the current CDC blood lead reference value?

3.5 micrograms per deciliter. Texas DSHS adopted this updated reference value on January 1, 2023.

How many lead service lines exist in Houston’s water system?

Houston Public Works has inventoried 534,165 total service lines. Approximately 447,955 of those have unknown material on either the utility or customer side, as of the October 2024 initial inventory deadline.

When must pipes identified as lead be replaced?

Under the EPA’s Lead and Copper Rule Improvements announced in October 2024, utilities have ten years from the rule’s effective date to replace any lead service lines identified during the inventory process.

What are the 2025 EPA dust-lead action levels?

5 micrograms per square foot on floors, 40 micrograms per square foot on window sills, and 100 micrograms per square foot on window troughs. Full compliance is required by January 12, 2026.

What is the EPA soil-lead screening level?

200 parts per million for residential properties, reduced from the prior 400 ppm. A 100 ppm trigger applies in properties with multiple lead sources.

Who certifies lead inspectors in Texas?

The Environmental Lead Program at the Texas Department of State Health Services, under the Texas Environmental Lead Reduction Rules. Six disciplines are certified: Lead Inspector, Lead Risk Assessor, Lead Abatement Supervisor, Lead Abatement Worker, Lead Abatement Project Designer, and Lead Firm.

Does AirMD remediate lead?

No. AirMD is an independent testing firm. We perform inspections, laboratory analysis, and reporting. We do not perform abatement or remediation. The independence of the testing firm from the remediation firm is deliberate and protects the integrity of the findings.

Commission Lead Testing for Your Houston Property

Houston property owners who manage pre-1978 assets, operate in the Houston Health Department’s 16 high-risk zip codes, or hold buildings that were flagged during the Houston Public Works water service line inventory should commission lead testing before the January 2026 EPA enforcement deadline. AirMD provides independent lead inspection, risk assessment, dust-wipe sampling, water sampling, and soil sampling across Houston, Harris County, and surrounding Gulf Coast communities, with the same independent testing framework applied to our Dallas lead testing services and Austin lead testing services. Call 1-888-GO-AIRMD or visit our Houston lead testing page to schedule an inspection.