How hard is the water in Turlock, CA?

Tap water hardness
98mg/L
5.8gpg
Moderately hard

Reported by Turlock, City of · April 2025

CA typical
121 mg/L
EPA health violations since 2016
1
Softener for 3 people
24k grain
Data
Utility report

Turlock water measures 98 mg/L (5.8 gpg) of hardness, moderately hard by USGS standards. The number comes from Turlock, City of, dated April 2025.

Turlock on the hardness scale, with nearby cities
060120180240300360+CA typical 121Waterford: 16 mg/LWaterford 16Modesto: 44 mg/LModesto 44West Modesto: 44 mg/LWest Modesto 44Salida: 44 mg/LSalida 44Ceres: 66 mg/LCeres 66Oakdale: 94 mg/LOakdale 94Denair: 118 mg/LDenair 118Atwater: 138 mg/LAtwater 138Riverbank: 196 mg/LRiverbank 196Patterson: 471 mg/LPatterson 471Turlock 98mg/L as calcium carbonate060120180240300360+CA 121Waterford: 16 mg/LWaterford 16Modesto: 44 mg/LModesto 44West Modesto: 44 mg/LWest Modes. 44Ceres: 66 mg/LCeres 66Denair: 118 mg/LDenair 118Riverbank: 196 mg/LRiverbank 19698 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 98 mg/L, Turlock is 23 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 16 mg/L in Waterford to 471 in Patterson.

What 98 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 Turlock

3 people × 75 gallons a day × 5.8 gpg = 1,294 grains a day. A 24,000-grain unit regenerates about every 18 days.

Size it for your household

EPA record for Turlock's water system

Turlock, City of · PWSID CA5010019

1 health-based violation since 2016

Serves about 72,888 people from surface water.

Health-based
1
Monitoring or reporting
0
Open now
0
20162017201820192020202120222023202420252026Nitrate'16'18'20'22'24'26Nitrate
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Nitrateoften from fertilizer or septic systems12017Resolved

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 Turlock water hard?

Somewhat. It measures about 98 mg/L (5.8 grains per gallon), which the USGS classes as moderately hard.

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

About 5.8 gpg. One grain per gallon equals 17.1 mg/L, so 98 mg/L divided by 17.1 gives 5.8.

What size water softener do I need in Turlock?

For 3 people using 75 gallons each per day, 5.8 gpg works out to about 1,294 grains a day. A 24,000-grain softener covers that with a regeneration about every 18 days.

Has the Turlock water system had EPA violations?

EPA records show 1 health-based violation for Turlock, City of since 2016, involving Nitrate.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, April 28, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.