Westminster Water Hardness & Quality Report (2026)
Water Hardness
4.6 grains per gallon
Source
mixed
pH Level
7.5
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
182.1 mg/L
Est. Daily Cost
$0.21
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 Westminster, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Westminster | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7 yrs | 8.5 yrs | -18% |
| Washing Machine | 10.7 yrs | 12 yrs | -11% |
| Water Heater | 12.5 yrs | 15 yrs | -17% |
Regional Water Comparison
How Westminster compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Westminster, California | 78 mg/L | 4.1 ppt | 🟡 Moderately Hard | mixed |
| Stanton, California | 113 mg/L | 5.2 ppt | 🟡 Moderately Hard | mixed |
| Cypress, California | 74 mg/L | 4 ppt | 🟡 Moderately Hard | mixed |
| Garden Grove, California | 70 mg/L | 3.9 ppt | 🟡 Moderately Hard | mixed |
| Fountain Valley, California | 151.5 mg/L | 6.3 ppt | 🟠 Hard | mixed |
National Benchmark
How Westminster compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Westminster | 78 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Westminster home
Shop water softeners on Amazon.com →
What Makes Westminster's Water Unique?
Local geology and source profile
Westminster, California, in western Orange County north of Long Beach, receives its municipal water supply through the Golden State Water Company (Golden State Water) Westminster District, sourcing from the Orange County Water District (OCWD) groundwater basin — drawing from the Main San Gabriel Basin and Santa Ana Basin alluvial aquifer pumped via local wells, and from the Metropolitan Water District (MWD) imported water delivered through the Municipal Water District of Orange County (MWDOC) distribution system. Water hardness in Westminster measures 78 mg/L — classified as moderately soft.
Westminster's moderately soft supply reflects the Orange County groundwater basin's character in the western county zone. The OCWD's Main San Gabriel Basin groundwater in western Orange County is recharged by the Santa Ana River spreading grounds — carrying San Bernardino Mountains and Transverse Range runoff. The Santa Ana River headwaters drain the San Bernardino Mountains granodiorite (Cretaceous — calcium-poor crystalline rock) and the Santa Ana Canyon Precambrian–Mesozoic crystalline terrain. The MWDOC import fraction adds moderate minerals from MWD's Colorado River and SWP blend. The combination in the western Orange County zone produces a moderately soft supply — consistent with nearby Anaheim and Fountain Valley readings in the same groundwater basin.
With hardness at 78 mg/L, Westminster residents experience minimal to moderate scale challenges. Faucet aerators and showerheads develop deposits slowly — bi-monthly cleaning with citric acid solution is sufficient. Dishwashers produce clean glassware. Golden State Water Company consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from the Orange County Water District (OCWD) groundwater basin and Metropolitan Water District (MWD) imports via the Golden State Water Company – Westminster District — the Main San Gabriel and Santa Ana River alluvial basin recharged from the San Gabriel and Santa Ana Mountains granodiorite; the MWD-mixed Orange County groundwater produces moderately soft supply at 78 mg/L.