Hard water in Scotts Valley, CA
Reported by San Lorenzo Valley Water Dist · July 2025
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Scotts Valley water measures 148 mg/L (8.7 gpg) of hardness, hard by USGS standards. The number comes from San Lorenzo Valley Water Dist, dated July 2025. Reports for this system disagree, with values from 120 to 148 mg/L.
At 148 mg/L, Scotts Valley is 27 mg/L above the typical California figure of 121. Of the 10 nearest cities we track, 7 have softer water and 3 have harder. The range nearby runs from 98 mg/L in Aptos to 178 in Los Gatos.
What 148 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 148 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 × 8.7 gpg = 1,946 grains a day. A 24,000-grain unit regenerates about every 12 days.
EPA record for Scotts Valley's water system
No health-based violations since 2016
Serves about 11,197 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
EPA lists Scotts Valley Water District as the system serving Scotts Valley. The hardness figure above comes from a different system's report, which TapWaterData uses for Scotts Valley.
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 Scotts Valley water hard?
Yes. It measures about 148 mg/L (8.7 grains per gallon), which the USGS classes as hard.
What is the water hardness in Scotts Valley in grains per gallon?
About 8.7 gpg. One grain per gallon equals 17.1 mg/L, so 148 mg/L divided by 17.1 gives 8.7.
What size water softener do I need in Scotts Valley?
For 3 people using 75 gallons each per day, 8.7 gpg works out to about 1,946 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.
Has the Scotts Valley water system had EPA violations?
EPA records show no health-based violations for Scotts Valley Water District since 2016.
Nearby cities
- Live Oak147 mg/LHard
- Soquel132 mg/LHard
- Santa Cruz147 mg/LHard
- Capitola132 mg/LHard
- Pleasure Point132 mg/LHard
- Aptos98 mg/LModerately hard
- Rio del Mar98 mg/LModerately hard
- Los Gatos178 mg/LHard
- Saratoga178 mg/LHard
- Campbell178 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, July 7, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.