Garden Grove Water Hardness & Quality Report (2026)
Water Hardness
4.1 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
159.3 mg/L
Est. Daily Cost
$0.19
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 Garden Grove, your appliances are currently losing 9% efficiency due to mineral buildup.
| Appliance | In Garden Grove | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.3 yrs | 8.5 yrs | -14% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 12.8 yrs | 15 yrs | -15% |
Regional Water Comparison
How Garden Grove compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Garden Grove, California | 70 mg/L | 3.9 ppt | 🟡 Moderately Hard | mixed |
| Stanton, California | 113 mg/L | 5.2 ppt | 🟡 Moderately Hard | mixed |
| Fountain Valley, California | 151.5 mg/L | 6.3 ppt | 🟠 Hard | mixed |
| Westminster, California | 78 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
| Anaheim, California | 113.5 mg/L | 5.2 ppt | 🟡 Moderately Hard | mixed |
National Benchmark
How Garden Grove compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Garden Grove | 70 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Garden Grove's Water Unique?
Local geology and source profile
Garden Grove, California receives its municipal water supply through the Garden Grove City Water Division, sourced from the Orange County Water District (OCWD) groundwater management program and Metropolitan Water District of Southern California (MWD) imported water. OCWD manages an extensive Groundwater Replenishment System that recharges the Orange County Groundwater Basin — a large alluvial basin underlying the densely populated coastal plain — using treated MWD imported water and advanced-purified recycled water. Garden Grove draws from production wells within this managed basin in Orange County. Water hardness measures 70 mg/L — classified as moderately soft, notably softer than many inland Southern California cities.
Garden Grove's moderate softness reflects the managed recharge character of the Orange County Basin. OCWD's aggressive artificial recharge program fills the basin predominantly with MWD imported water — a blend containing a substantial State Water Project fraction from Sierra Nevada snowmelt, which is inherently soft. The alluvial basin material — Quaternary river gravels, sands, and silts of the Santa Ana River — does not significantly add to hardness during the recharge process, maintaining the relatively soft imported water character in the extracted groundwater. Longer-residence deeper groundwater contributes some additional minerals but is diluted by the recharge fraction.
With hardness at 70 mg/L, Garden Grove residents enjoy relatively soft water with minimal scale challenges. Faucet aerators and showerheads can go several months between cleanings, and kettles develop only a light mineral ring over time. Soap and shampoo lather freely, and dishwashers produce largely clean glassware without heavy rinse-aid reliance. Hot water systems experience minimal long-term scale build-up. Garden Grove City Water consistently delivers water meeting all California State Water Resources Control Board and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply predominantly from Metropolitan Water District of Southern California (MWD) imports via the Orange County Water District, blended with Orange County Groundwater Basin alluvial aquifer water — high State Water Project fraction in the MWD blend and basin recharge from relatively soft imported water produces moderately soft supply at 70 mg/L.