Brentwood Water Hardness & Quality Report (2026)
Water Hardness
3 grains per gallon
Source
mixed
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
110.6 mg/L
Est. Daily Cost
$0.14
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Brentwood, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Brentwood | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.9 yrs | 8.5 yrs | -7% |
| Washing Machine | 11.7 yrs | 12 yrs | -3% |
| Water Heater | 13.6 yrs | 15 yrs | -9% |
Regional Water Comparison
How Brentwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Brentwood, California | 51 mg/L | 3.5 ppt | 🟢 Soft | mixed |
| Oakley, California | 145 mg/L | 6.2 ppt | 🟠 Hard | mixed |
| Discovery Bay, California | 29 mg/L | 2.8 ppt | 🟢 Soft | mixed |
| Antioch, California | 133.5 mg/L | 5.9 ppt | 🟠 Hard | mixed |
| Pittsburg, California | 128 mg/L | 5.7 ppt | 🟠 Hard | mixed |
National Benchmark
How Brentwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Brentwood | 51 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Brentwood's Water Unique?
Local geology and source profile
Brentwood, California, in east Contra Costa County in the San Joaquin Valley delta plain east of the Diablo Range — one of the Bay Area's fastest-growing communities in the 2000s–2010s, a major inner East Bay commuter suburb known for its agricultural heritage (cherry, peach, corn farms) and rapid master-planned residential expansion — draws its municipal water supply from the Los Vaqueros Reservoir (State Water Project–Delta water) via the Contra Costa Water District (CCWD) and local Delta area wells via the City of Brentwood Engineering and Public Works Water Division. Water hardness in Brentwood measures 51 mg/L — classified as very soft.
Brentwood's very soft supply reflects the CCWD Los Vaqueros Reservoir's State Water Project–Delta source. The Los Vaqueros Reservoir stores Sacramento–San Joaquin Delta water imported via the State Water Project — the Delta water at east Contra Costa County is a blend of Sacramento River (soft, draining the northern Sierra Nevada and Trinity Ranges) and San Joaquin River water. The CCWD treatment and Los Vaqueros storage produces a very soft supply for the east Contra Costa County area. The moderate dilution from the Sacramento River's soft headwater contribution dominates, producing the 51 mg/L at Brentwood.
With hardness at 51 mg/L, Brentwood residents enjoy very soft water with essentially no scale challenges. City of Brentwood and CCWD consistently deliver water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the State Water Project (Delta) via the Contra Costa Water District (CCWD) Los Vaqueros Reservoir and local Delta–Marsh wells via the City of Brentwood Engineering and Public Works Water Division — the east Contra Costa County Sacramento–San Joaquin Delta plain and the Mount Diablo Range foothills; very soft supply at 51 mg/L in Contra Costa County.