Colusa, CA water hardness

Tap water hardness
33mg/L
1.9gpg
SoftReports range 33–71

Reported by Cedar Creek Mobilehome Park · November 2022

CA typical
121 mg/L
EPA health violations since 2016
0
Data
Utility report

The water in Colusa carries roughly 33 mg/L of dissolved calcium and magnesium, or 1.9 grains per gallon. That is soft water. The number comes from Cedar Creek Mobilehome Park, dated November 2022. Reports for this system disagree, with values from 33 to 71 mg/L.

Colusa on the hardness scale, with nearby cities
060120180240300360+CA typical 121Lincoln: 15 mg/LLincoln 15Oroville: 24 mg/LOroville 24Woodland: 44 mg/LWoodland 44Clearlake: 96 mg/LClearlake 96Marysville: 98 mg/LMarysville 98Durham: 154 mg/LDurham 154Chico: 154 mg/LChico 154Plumas Lake: 197 mg/LPlumas Lake 197Yuba City: 247 mg/LYuba City 247Orland: 356 mg/LOrland 356Colusa 33mg/L as calcium carbonate060120180240300360+CA 121Oroville: 24 mg/LOroville 24Clearlake: 96 mg/LClearlake 96Marysville: 98 mg/LMarysville 98Durham: 154 mg/LDurham 154Plumas Lake: 197 mg/LPlumas Lake 197Yuba City: 247 mg/LYuba City 24733 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Colusa sits 88 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 15 mg/L in Lincoln to 356 in Orland.

What 33 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 33 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Colusa's water system

City of Colusa · PWSID CA0610002

No health-based violations since 2016

Serves about 6,675 people from groundwater.

Health-based
0
Monitoring or reporting
3
Open now
0

EPA lists City of Colusa as the system serving Colusa. The hardness figure above comes from a different system's report, which TapWaterData uses for Colusa.

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 Colusa water hard?

No. It measures about 33 mg/L (1.9 grains per gallon), which the USGS classes as soft.

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

About 1.9 gpg. One grain per gallon equals 17.1 mg/L, so 33 mg/L divided by 17.1 gives 1.9.

Has the Colusa water system had EPA violations?

EPA records show no health-based violations for City of Colusa since 2016. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, November 2, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.