ZipCheckup grade for 77521: C.
A mixed picture - some signals here are worth your attention.
Your top priority: match a filter's certification to the violations (10 health-based violations). Check your ZIP → NSF certified filters
Baytown, TX (77521): PFAS Detected in Mapped Water Systems - 58/100
EPA data combined for 19 water systems mapped to this ZIP (largest mapped system: City of Baytown)
Health-based violation records by water system:
- City of Mont Belvieu (5)
- Harris County Fwsd 1b (3)
- TX1010112 (1)
- Country Terrace Subdivision (1)
EPA records for the water systems mapped to 77521 in Baytown, TX contain 44 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 10 are marked health-based.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water EPA records for water systems mapped to this ZIP show 10 health-based violations and 34 non-health-based (since 2021).
- Lead The reported 90th-percentile lead result of 0.0021 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
- PFAS At least one PFAS result is above an EPA MCL value (UCMR5 sampling; MCL compliance required from 2029).
- Radon EPA Zone 3 - county-level radon potential, not evidence of a low home result.
- Flood 2,099 cumulative NFIP claim records. This historical count is not a current property-risk verdict.
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The Baytown (77521) record carries 2 critical-level alerts alongside 0 high-priority findings across all tracked safety categories.
Score Breakdown
Overall Home Safety Score: 58/100
This is the published model score. Component and domain values are shown independently; they are not added together on this page.
Canonical components
Required domains
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 77521 in Baytown, Texas is mapped to the water system City of Baytown (EPA ID: TX1010003). This system provides water to approximately 86,004 people from surface water sources.
There are 19 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| City of Baytown | TX1010003 | 86,004 | Surface water |
| Lake Municipal Utility District | TX1011741 | 6,048 | Surface water |
| Spring Meadows Municipal Utility District | TX1013261 | 4,200 | Surface water |
| Harris County Fwsd 27 | TX1010261 | 2,190 | Surface water |
| Harris County Fwsd 1a | TX1010082 | 2,640 | Surface water |
Other Water Quality Reports in Texas
- 73301 (Austin)
- 73344 (Austin)
- 73960 (Texhoma)
- 75001 (Addison) - 2 violations recorded for mapped water systems
- 75002 (Allen) - 14 violations recorded for mapped water systems
- 75006 (Carrollton) - 2 violations recorded for mapped water systems
- 75007 (Carrollton) - 1 violation recorded for mapped water systems
- 75009 (Celina) - 18 violations recorded for mapped water systems
- 75010 (Carrollton) - 1 violation recorded for mapped water systems
- 75011 (Carrollton)
- 75013 (Allen)
- 75014 (Irving)
- 75015 (Irving)
- 75016 (Irving)
- 75017 (Irving)
- 75019 (Coppell) - 5 violations recorded for mapped water systems
- 75020 (Denison) - 38 violations recorded for mapped water systems
- 75021 (Denison) - 30 violations recorded for mapped water systems
- 75022 (Flower Mound) - 18 violations recorded for mapped water systems
- 75023 (Plano)
Nearby Water Quality Reports
- 77520 (Baytown) - 2 mi - 9 violations recorded for mapped water systems
- 77522 (Baytown) - 2 mi
- 77562 (Highlands) - 6 mi - 21 violations recorded for mapped water systems
- 77523 (Baytown) - 7 mi - 36 violations recorded for mapped water systems
- 77580 (Mont Belvieu) - 7 mi - 5 violations recorded for mapped water systems
- 77571 (La Porte) - 8 mi - 7 violations recorded for mapped water systems
- 77572 (La Porte) - 8 mi
- 77530 (Channelview) - 10 mi - 9 violations recorded for mapped water systems
- 77536 (Deer Park) - 11 mi - 3 violations recorded for mapped water systems
- 77507 (Pasadena) - 11 mi - 5 violations recorded for mapped water systems
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for City of Baytown (TX1010003) 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.
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 77521. One or more compound results are above the level of a federal PFAS MCL with compliance required from 2029.
Detected compounds: PFPeA, PFBA, PFHxA, PFOS, PFBS, 6:2 FTS, PFHxS, PFHpA.
Highest measured level: 0.157 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.
Environmental Hazards (11) HIGH
Home & Infrastructure (6) OK
Cost & Community (9) HIGH
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in Baytown
Based on local data for ZIP 77521, 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 Baytown has 2,099 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 NeedsService 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 77521 safe to drink?
EPA SDWIS records 44 violations since 2021 across the water systems mapped to ZIP 77521 (primary system: City of Baytown), including 10 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 77521's water come from?
The recorded water source for City of Baytown, a system mapped to ZIP code 77521, is Surface water. This system serves approximately 86,004 people.
How does Baytown water compare to the national average?
Baytown's Home Safety Score ranks lower than 85% of U.S. ZIP codes, and lower than 100% of ZIP codes within Texas.
How can I get my water tested in Baytown?
If City of Baytown 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.
Is lead a concern in 77521 tap water?
The Lead and Copper Rule record selected for 77521 reports a 90th-percentile lead result of 0.0021 mg/L for a water system mapped to this ZIP (record date 2025-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.
What is the radon risk for 77521?
77521 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 77521's water?
Yes, PFAS have been detected in samples from water systems mapped to 77521. One or more PFAS results are above the level of a federal PFAS MCL with compliance required from 2029. 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 77521?
FEMA records contain 2099 flood insurance claims filed in ZIP code 77521; 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
ZipCheckup. (2026). Baytown, TX (77521): PFAS Detected in Mapped Water Systems - 58/100. https://zipcheckup.com/report/77521/
@misc{zipcheckup-report-77521,
author = {{ZipCheckup}},
title = {{Baytown, TX (77521): PFAS Detected in Mapped Water Systems - 58/100}},
year = {2026},
url = {https://zipcheckup.com/report/77521/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 77521
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 77520 | Baytown, TX | 1.7 mi | B | 9 |
| 77522 | Baytown, TX | 2.5 mi | N/A | 0 |
| 77562 | Highlands, TX | 5.8 mi | C | 21 |
| 77523 | Baytown, TX | 6.5 mi | N/A | 36 |
| 77580 | Mont Belvieu, TX | 7.1 mi | N/A | 5 |
| 77571 | La Porte, TX | 7.5 mi | A | 7 |
| 77572 | La Porte, TX | 7.8 mi | N/A | 0 |
| 77530 | Channelview, TX | 9.8 mi | A | 9 |
| 77536 | Deer Park, TX | 11.0 mi | B | 3 |
| 77507 | Pasadena, TX | 11.4 mi | N/A | 5 |
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