Tap Water Quality Report
Tap water quality in BRENTWOOD, California
Tap water in BRENTWOOD, California receives a grade of D (65/100) from TapWaterSafety.org. It's served by BRENTWOOD. The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Chromium (hexavalent) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in BRENTWOOD's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving BRENTWOOD.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 35.2 ppb, 352x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 31.6 ppb, 210x above the EWG health guideline of 0.15 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 3.71 ppb, 186x above the EWG health guideline of 0.02 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.561 ppb.
EPA compliance record
Official U.S. EPA records for BRENTWOOD (system ID CA0710004) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for BRENTWOOD
Filters matched to the specific contaminants in BRENTWOOD's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in BRENTWOOD's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA5) Disinfection byproduct |
35.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 352× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
31.6 ppb | 0.15 | 80.0 | 100 | — | — | — | 210× over |
| Chromium (hexavalent) Heavy metal |
3.71 ppb | 0.02 | — | — | — | — | — | 186× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
8.9 ppb | 0.06 | — | — | — | — | — | 148× over |
| Arsenic Heavy metal |
0.561 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 140× over |
| Bromodichloromethane Disinfection byproduct |
7.99 ppb | 0.06 | — | — | — | — | — | 133× over |
| Dibromochloromethane Disinfection byproduct |
9.36 ppb | 0.1 | — | — | — | — | — | 94× over |
| Dibromoacetic acid Disinfection byproduct |
1.63 ppb | 0.03 | — | — | — | — | — | 54× over |
| Nitrate and nitrite Inorganic |
3.48 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 25× over |
| Nitrate Inorganic |
3.28 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 23× over |
| Chloroform Disinfection byproduct |
7.08 ppb | 0.4 | — | — | — | — | — | 18× over |
| Bromoform Disinfection byproduct |
6.4 ppb | 0.5 | — | — | — | — | — | 13× over |
| Dichloroacetic acid Disinfection byproduct |
2.52 ppb | 0.2 | — | — | — | — | — | 13× over |
| Trichloroacetic acid Disinfection byproduct |
0.814 ppb | 0.1 | — | — | — | — | — | 8.1× over |
| Uranium Radiological |
2.3 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 5.3× over |
| Chlorate Disinfection byproduct |
103.1 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
5.91 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
7.49 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Bromochloromethane Other |
0.00528 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
2.84 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Perchlorate Disinfection byproduct |
0.0538 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
1.02 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
3.47 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0775 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0263 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.681 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.57 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
1.53 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.274 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
70.3 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from BRENTWOOD.