Monterey Water Hardness & Quality Report (2026)
Water Hardness
2.4 grains per gallon
Source
mixed
pH Level
7.2
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
87.2 mg/L
Est. Daily Cost
$0.11
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 Monterey, your appliances are currently losing 6% efficiency due to mineral buildup.
| Appliance | In Monterey | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.2 yrs | 8.5 yrs | -4% |
| Washing Machine | 12.1 yrs | 12 yrs | — |
| Water Heater | 13.9 yrs | 15 yrs | -7% |
Regional Water Comparison
How Monterey compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Monterey, California | 41.5 mg/L | 3.2 ppt | 🟢 Soft | mixed |
| Pacific Grove, California | 99.5 mg/L | 4.9 ppt | 🟡 Moderately Hard | mixed |
| Seaside, California | 150.5 mg/L | 6.4 ppt | 🟠 Hard | mixed |
| Marina, California | 124 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Salinas, California | 134 mg/L | 5.9 ppt | 🟠 Hard | mixed |
National Benchmark
How Monterey compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Monterey | 41.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Monterey's Water Unique?
Local geology and source profile
Monterey, California, the Monterey County seat — a major central California coastal historic and tourism city (Monterey is the Monterey County seat — one of the most historically and culturally significant cities in California; Monterey was the capital of California under Spanish colonial rule and under Mexico before the American conquest; the Monterey Presidio (1770) and Old Town Monterey State Historic Park represent one of the most intact collections of Spanish Colonial adobe architecture in the American West; Monterey is famous for Cannery Row (the historic sardine canning industry district, immortalized by John Steinbeck in his 1945 novel 'Cannery Row' — now a major tourist and restaurant destination) and the Monterey Bay Aquarium (one of the most important and respected marine science aquariums in the world — the Monterey Bay Aquarium is known for its stunning deep-sea exhibits, its kelp forest tank, and its conservation-focused marine biology research)), home of the Defense Language Institute (DLI — one of the most prestigious and unique US military education institutions, teaching over 70 languages), a diverse Monterey County community with a significant military, tourism, and fishing heritage population — draws its municipal water supply via the Monterey Peninsula Water Resources Agency. Water hardness in Monterey measures 41.5 mg/L — classified as very soft.
Monterey's very soft supply reflects the central California Monterey Peninsula coastal aquifer's calcareous-poor character. The Carmel River Basin at Monterey draws from Quaternary Carmel Valley alluvium (calcareous-poor). MPWRA treatment produces the very soft 41.5 mg/L.
With hardness at 41.5 mg/L, Monterey residents enjoy very soft water. Monterey Peninsula Water Resources Agency consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Carmel River Basin and Seaside Basin (Monterey Peninsula Water Resources Agency) via the Monterey Regional Water Pollution Control Agency — the Monterey County central California Monterey Peninsula corridor (Quaternary calcareous-poor Carmel Valley alluvium and Miocene calcareous-poor Santa Cruz Mudstone — the calcareous-poor central California coastal Monterey Peninsula aquifer; effective treatment); very soft supply at 41.5 mg/L in Monterey County.