Drinking water quality · 2026
· Verified
What's in Brentwood, CA tap water
11 contaminants were measured in the Brentwood, CA water system's 2026 annual report. Each is shown below against its federal limit.
- Reporting year
- 2026
- Contaminants measured
- 11
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Brentwood, CA
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
Lithium
● Detected (no federal limit)above national p90 (76.59999999999991 mg/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Brentwood, CA's drinking water comes from ground water, drawn from 6 sources.
Source
- WELL · 6
Treatment
- WELL 14 CHLORAMINATION FACILITY
- WELL 6 CHLORAMINATION FACILITY
- WELL 7 CHLORAMINATION FACILITY
- + 3 more
Distribution
Also buys water from CCWD/BRENTWOOD WTP, RANDALL-BOLD WATER TREATMENT PLANT.
Historical readings · EPA Six-Year Review (2012–2019)
2 contaminants historically over EPA limits in Brentwood, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
NITRATE worst: 2012 | 21.7 mg/L 2.2× | 10 mg/L | '12'13'14'15'16'17'18'19 |
GROSS BETA worst: 2017 | 6.5 mrem/yr 1.6× | 4 mrem/yr | '14'15'16'17'18'19 |
NITRATE NITRITE worst: 2016 | 8.8 mg/L 88% | 10 mg/L | '16'17'18'19 |
SELENIUM worst: 2018 | 0.021 mg/L within | 0.05 mg/L | '12'13'14'15'16'17'18'19 |
ARSENIC worst: 2014 | 0.0038 mg/L within below national p90 | 0.01 mg/L | '12'13'14'15'16'17'18'19 |
CHROMIUM worst: 2013 | 0.014 mg/L within above national p90 | 0.1 mg/L | '12'13'14'15'18'19 |
FLUORIDE worst: 2015 | 0.4 mg/L within | 4 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2019 | 0.0057 mg/L within | 0.06 mg/L | '19 |
DBAA worst: 2019 | 0.0022 mg/L | — | '19 |
DCAA worst: 2019 | 0.0029 mg/L | — | '19 |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 16.3 UG/LAverageDistribution | 80 UG/LMCL | Within the limit |
| BromodichloromethaneA trihalomethane disinfection byproduct. | 4.9125000000000005 UG/LAverageDistribution | None set | Detected — no federal limit |
| BromoformA trihalomethane disinfection byproduct. | 1.39375 UG/LAverageDistribution | None set | Detected — no federal limit |
| ChloroformA trihalomethane formed when chlorine reacts with organic matter in water. | 7.3625 UG/LAverageDistribution | None set | Detected — no federal limit |
| DibromochloromethaneA trihalomethane disinfection byproduct. | 2.73375 UG/LAverageDistribution | None set | Detected — no federal limit |
Other
People also ask about Brentwood, CA's water
+Is Brentwood, CA tap water safe to drink in 2026?
Every one of the 11 contaminants measured in Brentwood, CA's 2026 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in Brentwood, CA tap water?
11 contaminants were measured in Brentwood, CA's 2026 Consumer Confidence Report, spanning disinfection byproducts and other. 2 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from Brentwood, CA's 2026 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Brentwood, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2026 report; a new report will replace it once the utility publishes its next annual update.