Santa Ana Water Hardness & Quality Report (2026)
Water Hardness
4.5 grains per gallon
Source
mixed
pH Level
7.5
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
177.7 mg/L
Est. Daily Cost
$0.20
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 Santa Ana, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Santa Ana | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.5 yrs | 15 yrs | -17% |
Regional Water Comparison
How Santa Ana compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Santa Ana, California | 76.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
| Tustin, California | 134 mg/L | 5.8 ppt | 🟠 Hard | mixed |
| Orange, California | 45.5 mg/L | 3.2 ppt | 🟢 Soft | mixed |
| Tustin Legacy, California | 146.5 mg/L | 6.1 ppt | 🟠 Hard | mixed |
| North Tustin, California | 134 mg/L | 5.8 ppt | 🟠 Hard | mixed |
National Benchmark
How Santa Ana compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Santa Ana | 76.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Santa Ana's Water Unique?
Local geology and source profile
Santa Ana's water is supplied by the City of Santa Ana Public Works Agency, drawing from a blend of imported surface water from the Metropolitan Water District of Southern California (MWD) and local groundwater from the Orange County Groundwater Basin, managed by the Orange County Water District (OCWD). OCWD's Groundwater Replenishment System (GWRS) — the world's largest advanced water purification facility for groundwater replenishment — injects highly treated recycled water into the basin along with imported MWD water and Santa Ana River storm capture, maintaining groundwater levels and quality across the basin shared by Santa Ana and dozens of other Orange County cities. Santa Ana's urban density and its position within the OCWD basin-managed area mean it benefits from one of the most intensively managed regional groundwater systems in the country.
Santa Ana's relatively soft water at 76.5 mg/L is among the softer readings in Southern California, reflecting the Orange County Groundwater Basin character. The basin fills with alluvial deposits — sand and gravel derived primarily from San Gabriel Mountain granitic and metamorphic rock carried by the Santa Ana River — that produce moderately soft to soft groundwater. The GWRS product water injected into the basin is highly treated reverse-osmosis permeate that is extremely pure, further moderating basin hardness over time. The MWD import fraction, when Colorado River-dominated, would be harder — but OCWD's management dilutes this effectively, maintaining the basin's historically soft character.
Santa Ana residents enjoy relatively soft water by Southern California standards — noticeably better soap and shampoo performance than in harder-water cities, minimal scale buildup on fixtures and appliances, and largely spot-free glassware in dishwashers. Descaling coffee makers and kettles every 4–6 months is sufficient, and no water softener is necessary for most Santa Ana households. The primary water quality consideration is taste, for which a basic carbon-block kitchen filter effectively addresses any chloramine residual from MWD treatment in the MWD-fraction periods.
Geology & Source: Metropolitan Water District Colorado River and SWP Sierra Nevada imports blended with Orange County Groundwater Basin Quaternary alluvial aquifer — relatively soft blended supply