El Monte, CA water hardness
Reported by San Gabriel Valley Water CO.-El Monte · July 2025
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 2
- Data
- Utility report
El Monte water measures 48 mg/L (2.8 gpg) of hardness, soft by USGS standards. The number comes from San Gabriel Valley Water CO.-El Monte, dated July 2025.
At 48 mg/L, El Monte is 73 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 34 mg/L in South El Monte to 192 in East San Gabriel.
What 48 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 48 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 El Monte's water system
2 health-based violations since 2016
Serves about 240,000 people from groundwater.
- Health-based
- 2
- Monitoring or reporting
- 0
- Open now
- 0
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Groundwater Ruletreatment of well water | 2 | 2018–2019 | Resolved |
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 El Monte water hard?
No. It measures about 48 mg/L (2.8 grains per gallon), which the USGS classes as soft.
What is the water hardness in El Monte in grains per gallon?
About 2.8 gpg. One grain per gallon equals 17.1 mg/L, so 48 mg/L divided by 17.1 gives 2.8.
Has the El Monte water system had EPA violations?
EPA records show 2 health-based violations for San Gabriel Valley Water CO.-El Monte since 2016, involving Groundwater Rule.
Nearby cities
- South El Monte34 mg/LSoft
- Temple City113 mg/LModerately hard
- Avocado Heights34 mg/LSoft
- Mayflower Village135 mg/LHard
- Rosemead46 mg/LSoft
- South Monrovia Island75 mg/LModerately hard
- West Puente Valley109 mg/LModerately hard
- Arcadia54 mg/LSoft
- East San Gabriel192 mg/LVery hard
- San Gabriel116 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (utility report, July 21, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.