Pleasant Hill, CA (94523): PFAS Detected in Mapped Water Systems
EPA data combined for 3 water systems mapped to this ZIP (largest mapped system: Contra Costa Water District)
EPA records for the water systems mapped to 94523 in Pleasant Hill, CA contain zero recorded violations for inclusive record years 2021 through 2026. This does not establish that every category was monitored or published, and it does not cover events outside that source window.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water No drinking-water violations in EPA records since 2021.
- Lead The reported 90th-percentile lead result of 0.0031 mg/L is below the EPA action level for water systems; 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 2 - county-level radon potential, not a home measurement.
- Flood 60 cumulative NFIP claim records. Check the current FEMA map for a specific address.
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High-priority alerts for 94523 in Pleasant Hill total 1, with zero critical-level findings documented.
Score Breakdown
Overall Home Safety Score: Score unavailable
Required evidence is missing. Missing values remain unknown and are not imputed or renormalized.
Canonical components
Required domains
Coverage: 3 of 4 components and 2 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (7) HIGH
Your Water System
ZIP code 94523 in Pleasant Hill, California is mapped to the water system Contra Costa Water District (EPA ID: CA0710003). This system provides water to approximately 198,000 people from surface water sources.
There are 3 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| Contra Costa Water District | CA0710003 | 198,000 | Surface water |
| East Bay Municipal Utility District | CA0110005 | 1,442,800 | Surface water |
| City of Martinez | CA0710006 | 30,997 | Surface water |
Other Water Quality Reports in California
- 90001 (Los Angeles)
- 90002 (Los Angeles)
- 90003 (Los Angeles)
- 90004 (Los Angeles)
- 90005 (Los Angeles)
- 90006 (Los Angeles)
- 90007 (Los Angeles)
- 90008 (Los Angeles)
- 90009 (Los Angeles)
- 90010 (Los Angeles)
- 90011 (Los Angeles)
- 90012 (Los Angeles)
- 90013 (Los Angeles)
- 90014 (Los Angeles)
- 90015 (Los Angeles)
- 90016 (Los Angeles)
- 90017 (Los Angeles)
- 90018 (Los Angeles)
- 90019 (Los Angeles)
- 90020 (Los Angeles)
Nearby Water Quality Reports
- 94597 (Walnut Creek) - 2 mi
- 94518 (Concord) - 3 mi
- 94520 (Concord) - 3 mi
- 94522 (Concord) - 3 mi
- 94524 (Concord) - 3 mi
- 94529 (Concord) - 3 mi
- 94596 (Walnut Creek) - 4 mi
- 94598 (Walnut Creek) - 4 mi
- 94519 (Concord) - 4 mi
- 94553 (Martinez) - 4 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Contra Costa Water District (CA0710003) on EPA.gov.
5 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 94523.
Detected compounds: PFBA.
Highest measured level: 0.0052 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) MODERATE
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 Pleasant Hill
Based on local data for ZIP 94523, 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 Pleasant Hill has 60 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)
Gutter Installation & Repair
The median home in 94523 was built around 1978. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.
Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home
Estimate Your Home Maintenance CostsWindow Replacement
The median build year of homes in Pleasant Hill is 1978; check the age and condition of your own windows. ENERGY STAR windows can save $101–$583/year on energy bills.
Typical cost: Window replacement: typically $300–$800 per window installed
Estimate Your Home Maintenance CostsRoofing Inspection & Repair
Homes built around 1978 may be on their second or third roof. A professional inspection can catch damage before leaks start.
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 94523 safe to drink?
EPA SDWIS records 0 violations since 2021 across the water systems mapped to ZIP 94523 (primary system: Contra Costa Water District), including 0 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 94523's water come from?
The recorded water source for Contra Costa Water District, a system mapped to ZIP code 94523, is Surface water. This system serves approximately 198,000 people.
How can I get my water tested in Pleasant Hill?
If Contra Costa Water 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.
Is lead a concern in 94523 tap water?
The Lead and Copper Rule record selected for 94523 reports a 90th-percentile lead result of 0.0031 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 94523?
94523 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Contra Costa 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 94523's water?
Yes, PFAS have been detected in samples from water systems mapped to 94523. 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 94523?
FEMA records contain 60 flood insurance claims filed in ZIP code 94523; the recorded rated-zone value (the most frequent one if there are several claims) is B, 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). Pleasant Hill, CA (94523): PFAS Detected in Mapped Water Systems. https://zipcheckup.com/report/94523/
@misc{zipcheckup-report-94523,
author = {{ZipCheckup}},
title = {{Pleasant Hill, CA (94523): PFAS Detected in Mapped Water Systems}},
year = {2026},
url = {https://zipcheckup.com/report/94523/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 94523
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 94597 | Walnut Creek, CA | 2.5 mi | N/A | 0 |
| 94518 | Concord, CA | 2.6 mi | N/A | 0 |
| 94520 | Concord, CA | 2.8 mi | N/A | 0 |
| 94522 | Concord, CA | 2.9 mi | N/A | 0 |
| 94524 | Concord, CA | 2.9 mi | N/A | 0 |
| 94529 | Concord, CA | 2.9 mi | N/A | 0 |
| 94596 | Walnut Creek, CA | 3.5 mi | N/A | 0 |
| 94598 | Walnut Creek, CA | 3.5 mi | N/A | 0 |
| 94519 | Concord, CA | 4.0 mi | N/A | 0 |
| 94553 | Martinez, CA | 4.0 mi | N/A | 0 |
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