Brea Water Hardness & Quality Report (2026)
Water Hardness
16.2 grains per gallon
Source
reservoir
pH Level
7.3
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
110.3 mg/L
Est. Daily Cost
$0.74
energy & soap waste
Source: See methodology section below · 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 Brea, your appliances are currently losing 37% efficiency due to mineral buildup.
| Appliance | In Brea | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3.3 yrs | 12 yrs | -73% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Brea compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Brea, California | 278 mg/L | 0 ppt | 🔴 Very Hard | reservoir |
| La Habra, California | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | reservoir |
| Fullerton, California | ≈ 180+ mg/L | 222.2 ppt | 🔴 Very Hard | reservoir |
| Placentia, California | ≈ 180+ mg/L | 47.6 ppt | 🔴 Very Hard | reservoir |
| Rowland Heights, California | ≈ 120–179 mg/L | 22.7 ppt | 🟠 Hard | reservoir |
National Benchmark
How Brea compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Brea | 278 mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Brea's Water Unique?
Local geology and source profile
The City of Brea Water Division, part of the City of Brea Public Works Department, manages the potable water system serving approximately 45,629 residents in Brea, California, within Orange County. Water is sourced primarily from purchased surface water supplemented by groundwater; the key supplier is the Orange County Water District, drawing from local reservoirs and the Santa Ana River watershed, with upstream storage at Prado Dam. Chlorine residual disinfection is maintained throughout distribution, and the utility can be contacted at 714-990-7657, 1 Civic Center Circle, Brea, CA 92821.
The Santa Ana River basin watershed influences surface water quality, while underlying geology involves alluvial fans overlying the Orange County Forebay Groundwater Basin, with Pleistocene-age coastal plain sediments including calcareous sandstones and limestones. These carbonate-rich formations from ancient marine environments dissolve calcium and magnesium into both surface runoff and groundwater aquifers during recharge and conveyance, imparting a very hard character — a natural trait of Southern California's sedimentary basin aquifer systems.
At 278 mg/L, Brea's very hard water promotes significant scale buildup in pipes, water heaters, dishwashers, and washing machines. Faucet aerators and showerheads clog quickly; boilers face corrosion risks from mineral deposits. Regular vinegar descaling, scale-inhibiting filters, and annual hot water system flushing are essential maintenance measures. A water softener is highly recommended to prevent appliance damage and extend plumbing life. Tap water meets all federal EPA MCLGs and state standards per 2023–2024 reports, with no violations; chlorine disinfection byproducts remain below limits, and no specific PFAS, lead, or copper exceedances are reported.
Geology & Source: Santa Ana River basin — Quaternary alluvial deposits and Pleistocene calcareous sandstones over Orange County Forebay Groundwater Basin; ancient marine carbonate formations produce very hard water at 278 mg/L
Other California Water Reports
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Frequently Asked Questions
Is Brea's water safe to drink?
Do I need a water softener in Brea?
How does Brea compare to the USA average?
Data Sources & Methodology
Water quality data for Brea is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.