How hard is the water in Denair, CA?

Tap water hardness
118mg/L
6.9gpg
Moderately hard

Reported by Denair Community Services District · August 2021

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

The water in Denair carries roughly 118 mg/L of dissolved calcium and magnesium, or 6.9 grains per gallon. That is moderately hard water. The number comes from Denair Community Services District, dated August 2021.

Denair 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 94Turlock: 98 mg/LTurlock 98Atwater: 138 mg/LAtwater 138Riverbank: 196 mg/LRiverbank 196Patterson: 471 mg/LPatterson 471Denair 118mg/L as calcium carbonate060120180240300360+CA 121Waterford: 16 mg/LWaterford 16Modesto: 44 mg/LModesto 44West Modesto: 44 mg/LWest Modes. 44Ceres: 66 mg/LCeres 66Turlock: 98 mg/LTurlock 98Riverbank: 196 mg/LRiverbank 196118 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Denair sits close to the typical California figure of 121 mg/L. Of the 10 nearest cities we track, 7 have softer water and 3 have harder. The range nearby runs from 16 mg/L in Waterford to 471 in Patterson.

What 118 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 Denair

3 people × 75 gallons a day × 6.9 gpg = 1,553 grains a day. A 24,000-grain unit regenerates about every 15 days.

Size it for your household

EPA record for Denair's water system

Denair Community Services District · PWSID CA5010021

No health-based violations since 2016

Serves about 5,093 people from groundwater.

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 Denair water hard?

Somewhat. It measures about 118 mg/L (6.9 grains per gallon), which the USGS classes as moderately hard.

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

About 6.9 gpg. One grain per gallon equals 17.1 mg/L, so 118 mg/L divided by 17.1 gives 6.9.

What size water softener do I need in Denair?

For 3 people using 75 gallons each per day, 6.9 gpg works out to about 1,553 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.

Has the Denair water system had EPA violations?

EPA records show no health-based violations for Denair Community Services District since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, August 25, 2021), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.