Concord Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
243.2 mg/L
Est. Daily Cost
$0.40
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 Concord, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Concord | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Concord compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Concord, California | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Pleasant Hill, California | ≈ 0–60 mg/L | 6.2 ppt | 🟢 Soft | groundwater |
| Walnut Creek, California | ≈ 120–179 mg/L | 6.3 ppt | 🟠 Hard | groundwater |
| Bay Point, California | ≈ 120–179 mg/L | 5.5 ppt | 🟠 Hard | mixed |
| Clayton, California | ≈ 180+ mg/L | 7.3 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Concord compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Concord | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Concord's Water Unique?
Local geology and source profile
Contra Costa Water District (CCWD) provides treated drinking water to Clayton, Clyde, Concord, Pacheco, Port Costa, and parts of Martinez, Pleasant Hill, and Walnut Creek in Contra Costa County. The utility sources water from four strategic diversion points in the Sacramento-San Joaquin River Delta, dynamically selecting intake locations to access the highest quality water available throughout the year. Water is treated at CCWD treatment plants — including activated carbon filtration — and distributed through a network of pipes across the service area.
Concord's water originates in the Sacramento-San Joaquin River Delta watershed, dominated by Quaternary alluvial deposits overlying Tertiary sedimentary formations including sandstone, siltstone, and clay. The Delta's rapid surface runoff and young alluvial geology limit the accumulation of dissolved calcium and magnesium compared to areas underlain by mineral-rich bedrock or limestone karst, producing a moderately hard supply. CCWD reports hardness between 59–87 mg/L as CaCO₃ (average 74 mg/L), with magnesium concentrations of 6.4–12 mg/L.
At moderately hard levels, residents may notice minor scale buildup on fixtures and reduced soap lathering, though effects are less pronounced than in hard-water areas. Water heaters and dishwashers will experience gradual mineral accumulation over time, potentially reducing efficiency and lifespan. Regular descaling of kettles and showerheads is recommended. A water softener is not essential but may be considered optional depending on individual preference and appliance protection goals. Water meets all EPA and state drinking water standards.
Geology & Source: Sacramento–San Joaquin River Delta — Quaternary alluvial deposits over Tertiary sandstone, siltstone, and clay; rapid surface flow and young sediments limit mineral dissolution, producing moderately hard water
Other California Water Reports
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Frequently Asked Questions
Is Concord's water safe to drink?
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How does Concord compare to the USA average?
Data Sources & Methodology
Water quality data for Concord 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.