Hard water in Porterville, CA
Reported by Akin Water Company · September 2021
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
Tap water in Porterville has about 233 mg/L of hardness, which is 13.6 grains per gallon. On the USGS scale that counts as very hard. The number comes from Akin Water Company, dated September 2021.
Porterville sits 112 mg/L above the typical California figure of 121. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 5 mg/L in McFarland to 303 in Lindsay.
What 233 mg/L means at home
Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.
Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.
Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.
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 233 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 × 13.6 gpg = 3,067 grains a day. A 24,000-grain unit regenerates about every 7 days.
EPA record for Porterville's water system
No health-based violations since 2016
Serves about 86 people from groundwater. EPA lists this system as inactive.
- Health-based
- 0
- Monitoring or reporting
- 1
- 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 Porterville water hard?
Yes. It measures about 233 mg/L (13.6 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Porterville in grains per gallon?
About 13.6 gpg. One grain per gallon equals 17.1 mg/L, so 233 mg/L divided by 17.1 gives 13.6.
What size water softener do I need in Porterville?
For 3 people using 75 gallons each per day, 13.6 gpg works out to about 3,067 grains a day. A 24,000-grain softener covers that with a regeneration about every 7 days.
Has the Porterville water system had EPA violations?
EPA records show no health-based violations for Akin Water Company since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Lindsay303 mg/LVery hard
- Tulare37 mg/LSoft
- Delano181 mg/LVery hard
- Visalia74 mg/LModerately hard
- Corcoran64 mg/LModerately hard
- McFarland5 mg/LSoft
- Orosi170 mg/LHard
- Wasco181 mg/LVery hard
- Dinuba92 mg/LModerately hard
- Hanford11 mg/LSoft
Hardness data: TapWaterData US Water Hardness (utility report, September 26, 2021), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.