How hard is the water in Healdsburg, CA?

Tap water hardness
93mg/L
5.5gpg
Moderately hard

Reported by Healdsburg, City of · August 2025

CA typical
121 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

Tap water in Healdsburg has about 93 mg/L of hardness, which is 5.5 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from Healdsburg, City of, dated August 2025.

Healdsburg on the hardness scale, with nearby cities
060120180240300360+CA typical 121Napa: 54 mg/LNapa 54Boyes Hot Springs: 62 mg/LBoyes Hot Springs 62Sonoma: 84 mg/LSonoma 84Clearlake: 96 mg/LClearlake 96Petaluma: 105 mg/LPetaluma 105Rohnert Park: 106 mg/LRohnert Park 106Cotati: 106 mg/LCotati 106Windsor: 120 mg/LWindsor 120Santa Rosa: 121 mg/LSanta Rosa 121Sebastopol: 142 mg/LSebastopol 142Healdsburg 93mg/L as calcium carbonate060120180240300360+CA 121Clearlake: 96 mg/LClearlake 96Rohnert Park: 106 mg/LRohnert Pa. 106Cotati: 106 mg/LCotati 106Windsor: 120 mg/LWindsor 120Santa Rosa: 121 mg/LSanta Rosa 121Sebastopol: 142 mg/LSebastopol 14293 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Healdsburg sits 28 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 54 mg/L in Napa to 142 in Sebastopol.

What 93 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Healdsburg

3 people × 75 gallons a day × 5.5 gpg = 1,228 grains a day. A 24,000-grain unit regenerates about every 19 days.

Size it for your household

EPA record for Healdsburg's water system

Healdsburg, City of · PWSID CA4910005

No health-based violations since 2016

Serves about 10,972 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 Healdsburg water hard?

Somewhat. It measures about 93 mg/L (5.5 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Healdsburg in grains per gallon?

About 5.5 gpg. One grain per gallon equals 17.1 mg/L, so 93 mg/L divided by 17.1 gives 5.5.

What size water softener do I need in Healdsburg?

For 3 people using 75 gallons each per day, 5.5 gpg works out to about 1,228 grains a day. A 24,000-grain softener covers that with a regeneration about every 19 days.

Has the Healdsburg water system had EPA violations?

EPA records show no health-based violations for Healdsburg, City of since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, August 4, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.