ZipCheckup grade for 77070: B.

This ZIP has a few items worth a quick check.

Your top priority: review your flood insurance coverage. Check your ZIP → FloodSmart

Health Violations Found
B 84

Houston, TX (77070): PFAS Detected in Mapped Water Systems - 84/100

EPA data combined for 20 water systems mapped to this ZIP (largest mapped system: Mills Road Municipal Utility District)

Health Violations Found PFAS Detected NFIP Claim History

Health-based violation records by water system:

EPA records for the water systems mapped to 77070 in Houston, TX contain 26 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 1 are marked health-based.

Data source: U.S. Environmental Protection Agency (EPA) SDWIS

Based on EPA Drinking Water FEMA Flood Data U.S. Census CDC Energy Information Admin. USGS Water Data & 9 more federal sources
Latest air quality, EPA records and weather alerts Current data temporarily unavailable
Current EPA violation data unavailable
Water records and current conditions
Current EPA violation data unavailable
Safety Score
B 84/100
Water Quality Issues 1 health-based violation
Lead Risk Below action level Below the reporting limit, 90th percentile, sample period ending 2025-12-31
NFIP Claim History Claim records 1,834 claims
Data confidence: High (direct measurement) Medium (sampled / sub-geography) Low (modeled / inferred) Methodology →

At a Glance

  • Water EPA records for water systems mapped to this ZIP show 1 health-based violation and 25 non-health-based (since 2021).
  • Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
  • PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
  • Radon EPA Zone 3 - county-level radon potential, not evidence of a low home result.
  • Flood 1,834 cumulative NFIP claim records. This historical count is not a current property-risk verdict.
Contaminant Summary
Health Violations
26 violations 1 health-based PFAS detected 1 risk identified
Report data assembled: Jul 27, 2026 EPA water-system identity: source date or period is not present in ZipCheckup's accepted source record EPA violation history: more than two update cycles old Lead, copper and UCMR measurements: source date or period is not present in ZipCheckup's accepted source record
B
ZIP-level Home Safety model score: 84 / 100
Home Safety Score higher than 79% of ZIP codes nationwide
20
Water Systems
6,717
People Served
1
Health Violations (since 2021)Median is 0
Surface water
Water Source
Zone 3
County Radon Potential · Low
$264K
Median Home Value36% above state median ($195K)

Get updates when new water-quality data is available for your area

Free alerts when new EPA data affects ZIP code 77070. No spam - just safety updates.

Unsubscribe anytime. We only send updates when your safety score changes. See our Privacy Policy.

Share Your Area Home Safety Score
Share on X Share on Facebook

Tip: You can also screenshot the card above to share it as an image.

See incorrect data? Let us know

Score Breakdown

Overall Home Safety Score: 84/100

This is the published model score. Component and domain values are shown independently; they are not added together on this page.

Canonical components

EPA water compliance
56/100
Observed
PFAS MCL screen
100/100
Observed
EPA radon zone
100/100
Observed
Annual EPA AirData AQI
75/100
Observed

Required domains

Drinking water
78/100
Indoor environment
100/100
Outdoor environment
75/100

Coverage: 4 of 4 components and 3 of 3 domains observed.

Model 4.0.0; series home-safety-v4-cross-vertical.

Safety & Health (8) CRITICAL

Your Water System

ZIP code 77070 in Houston, Texas is mapped to the water system Mills Road Municipal Utility District (EPA ID: TX1011107). This system provides water to approximately 6,717 people from surface water sources.

There are 20 community water systems serving this area.

Water Systems Serving This Area

System Name EPA ID Population Source
Mills Road Municipal Utility District TX1011107 6,717 Surface water
Cypress Creek Utility District TX1010430 2,988 Surface water
Prestonwood Forest Utility District TX1010467 5,940 Surface water
City of Houston Willow Chase TX1011902 14,169 Groundwater
Emerald Forest Utility District TX1010541 7,326 Groundwater

Other Water Quality Reports in Texas

Nearby Water Quality Reports

Data Sources

This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Mills Road Municipal Utility District (TX1011107) on EPA.gov.

4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.

📊 EPA Safe Drinking Water · View source →

PFAS Contamination Detected

PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 77070.

Detected compounds: 6:2 FTS, PFPeA, PFBA, PFHxA, PFBS.

Highest measured level: 0.0426 µg/L

Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.

📊 EPA UCMR5 · View source →

Health Risks from Detected Contaminants

Fluoride

Moderate Risk

EPA reference value: 4 mg/L (estándar secundario: 2.0 mg/L)

Tooth & bone damage at high levels

At-risk groups: children aged 8 and younger during tooth development

Treatment options (verify a product is certified to reduce this contaminant): reverse osmosis, activated alumina, distillation · Find a filter →

Learn more about Fluoride in drinking water →

📊 EPA SDWIS + SDWA · View source →
Environmental Hazards (11) HIGH
Home & Infrastructure (6) OK
Cost & Community (8) HIGH

CPSC product recall notices

These national notices are not matched to this ZIP code or water system.

View all recalls →

📊 CPSC · View source →

Protect Your Home in Houston

Based on local data for ZIP 77070, these services may benefit homeowners in your area.

Based on local data for your area. Use the tools below to explore your options.

Home & Flood Insurance

The ZIP code for this report in Houston has 1,834 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.

Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote

Check Your Flood Zone (Free)

FEMA flood map lookup - see if your property is in a flood zone

Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)

Roofing Inspection & Repair

Active weather alerts in Texas increase the risk of roof damage from hail and high winds. A professional inspection can identify vulnerabilities.

Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500

Estimate Your Home Insurance Needs

Service recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.

Frequently Asked Questions

Is the tap water in 77070 safe to drink?

EPA SDWIS records 26 violations since 2021 across the water systems mapped to ZIP 77070 (primary system: Mills Road Municipal Utility District), including 1 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.

Where does 77070's water come from?

The recorded water source for Mills Road Municipal Utility District, a system mapped to ZIP code 77070, is Surface water. This system serves approximately 6,717 people.

How does Houston water compare to the national average?

Houston's Home Safety Score ranks better than 79% of U.S. ZIP codes, and at or above 54% within Texas.

How can I get my water tested in Houston?

If Mills Road Municipal Utility District supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.

What is the radon risk for 77070?

77070 is mapped to a county in EPA Radon Zone 3 (low county-level radon potential; EPA recommends testing every home), located in Harris County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.

Are there PFAS (forever chemicals) in 77070's water?

Yes, PFAS have been detected in samples from water systems mapped to 77070. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.

What does the NFIP claim history show for ZIP 77070?

FEMA records contain 1834 flood insurance claims filed in ZIP code 77070; the recorded rated-zone value (the most frequent one if there are several claims) is X, which is claims evidence and may differ from the current FEMA map zone for a property. This is a substantial claim history, but claim count is not a count of distinct events or properties. Review FEMA's map for the specific property.

How to cite this page

APA ZipCheckup. (2026). Houston, TX (77070): PFAS Detected in Mapped Water Systems - 84/100. https://zipcheckup.com/report/77070/
BibTeX 
@misc{zipcheckup-report-77070,
  author = {{ZipCheckup}},
  title  = {{Houston, TX (77070): PFAS Detected in Mapped Water Systems - 84/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/report/77070/}
}

Page version: October 2026.

Nearby ZIP Code Reports

Water quality comparison for ZIP codes near 77070

ZIP Code City, State Distance Grade Violations
77429 Cypress, TX 3.3 mi B 37
77069 Houston, TX 3.6 mi A 18
77065 Houston, TX 3.7 mi B 41
77064 Houston, TX 4.3 mi B 30
77379 Spring, TX 5.0 mi B 35
77066 Houston, TX 5.3 mi B 22
77068 Houston, TX 5.8 mi A 11
77086 Houston, TX 6.4 mi B 14
77410 Cypress, TX 7.0 mi N/A 0
77375 Tomball, TX 7.0 mi B 82

Contaminants Detected in 77070

Learn more about the contaminants found in your water supply:

Overall safety breakdown

Home Safety Score →

Find the right water filter

Water Filter Matcher →

Compare filters, tests & services

Compare My Options →

Compare with another ZIP

Compare Tool →
Coverage: 14/17 risk factors Data sources →
Get alerts for 77070