Water Quality Report · Updated May 12, 2026
BRENTWOOD
BRENTWOOD delivers tap water graded D (64/100) by TapWaterSafety.org. The utility serves approximately 64,513 residents in BRENTWOOD, California using surface water (purchased). 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. For questions, the utility can be reached at 925-516-6025.
Is BRENTWOOD tap water safe to drink?
BRENTWOOD delivers tap water that earns a grade of D (64/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including haloacetic acids (haa5) significantly above health guideline.
The utility serves 64,513 residents in BRENTWOOD, drawing from surface water (purchased).
Public testing data identifies 15 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Chromium (hexavalent), Haloacetic acids (HAA9), Arsenic, Bromodichloromethane, Dibromochloromethane, Dibromoacetic acid, Nitrate and nitrite, Nitrate, Chloroform, Bromoform, Dichloroacetic acid, Trichloroacetic acid, Uranium. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for BRENTWOOD residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for 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.
Contact BRENTWOOD
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for BRENTWOOD
Filters matched to the specific contaminants in this water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 64/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
BRENTWOOD service area
This water system serves 1 community in Contra Costa County, California. Click any city for its dedicated tap water quality page.
Find the right filter for BRENTWOOD water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.