Hard water in Orosi, CA
Reported by Orosi Public Utility District · August 2022
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Orosi has about 170 mg/L of hardness, which is 9.9 grains per gallon. On the USGS scale that counts as hard. The number comes from Orosi Public Utility District, dated August 2022.
At 170 mg/L, Orosi is 49 mg/L above 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 11 mg/L in Hanford to 303 in Lindsay.
What 170 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 170 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 × 9.9 gpg = 2,236 grains a day. A 24,000-grain unit regenerates about every 10 days.
EPA record for Orosi's water system
No health-based violations since 2016
Serves about 8,300 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 Orosi water hard?
Yes. It measures about 170 mg/L (9.9 grains per gallon), which the USGS classes as hard.
What is the water hardness in Orosi in grains per gallon?
About 9.9 gpg. One grain per gallon equals 17.1 mg/L, so 170 mg/L divided by 17.1 gives 9.9.
What size water softener do I need in Orosi?
For 3 people using 75 gallons each per day, 9.9 gpg works out to about 2,236 grains a day. A 24,000-grain softener covers that with a regeneration about every 10 days.
Has the Orosi water system had EPA violations?
EPA records show no health-based violations for Orosi Public Utility District since 2016.
Nearby cities
- Dinuba92 mg/LModerately hard
- Reedley202 mg/LVery hard
- Visalia74 mg/LModerately hard
- Kingsburg91 mg/LModerately hard
- Selma202 mg/LVery hard
- Sanger202 mg/LVery hard
- Tulare37 mg/LSoft
- Hanford11 mg/LSoft
- Lindsay303 mg/LVery hard
- Sunnyside167 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, August 11, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.