Hard water in Pacific Grove, CA
Reported by Cal Am Water Company - Monterey · September 2025
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Pacific Grove water measures 169 mg/L (9.9 gpg) of hardness, hard by USGS standards. The number comes from Cal Am Water Company - Monterey, dated September 2025.
Pacific Grove sits 48 mg/L above the typical California figure of 121. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 98 mg/L in Rio del Mar to 215 in Watsonville.
What 169 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
At 169 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 9.9 gpg = 2,225 grains a day. A 24,000-grain unit regenerates about every 10 days.
EPA record for Pacific Grove's water system
No health-based violations since 2016
Serves about 128,928 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Pacific Grove water hard?
Yes. It measures about 169 mg/L (9.9 grains per gallon), which the USGS classes as hard.
What is the water hardness in Pacific Grove in grains per gallon?
About 9.9 gpg. One grain per gallon equals 17.1 mg/L, so 169 mg/L divided by 17.1 gives 9.9.
What size water softener do I need in Pacific Grove?
For 3 people using 75 gallons each per day, 9.9 gpg works out to about 2,225 grains a day. A 24,000-grain softener covers that with a regeneration about every 10 days.
Has the Pacific Grove water system had EPA violations?
EPA records show no health-based violations for Cal Am Water Company - Monterey since 2016.
Nearby cities
- Monterey160 mg/LHard
- Seaside160 mg/LHard
- Marina142 mg/LHard
- Salinas106 mg/LModerately hard
- Watsonville215 mg/LVery hard
- Rio del Mar98 mg/LModerately hard
- Pleasure Point132 mg/LHard
- Capitola132 mg/LHard
- Interlaken215 mg/LVery hard
- Santa Cruz147 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, September 29, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.