El Granada, CA water hardness
Reported by Coastside County Water District · July 2025
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Data
- Utility report
El Granada water measures 46 mg/L (2.7 gpg) of hardness, soft by USGS standards. The number comes from Coastside County Water District, dated July 2025. Reports for this system disagree, with values from 30 to 46 mg/L.
At 46 mg/L, El Granada is 75 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 7 have softer water and 2 have harder. The range nearby runs from 31 mg/L in Burlingame to 70 in Pacifica.
What 46 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 46 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 Granada's water system
No health-based violations since 2016
Serves about 19,033 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
TapWaterData ties El Granada to this system. EPA's service-area records do not name El Granada, so check the utility printed on your water bill.
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 Granada water hard?
No. It measures about 46 mg/L (2.7 grains per gallon), which the USGS classes as soft.
What is the water hardness in El Granada in grains per gallon?
About 2.7 gpg. One grain per gallon equals 17.1 mg/L, so 46 mg/L divided by 17.1 gives 2.7.
Has the El Granada water system had EPA violations?
EPA records show no health-based violations for Coastside County Water District since 2016.
Nearby cities
- Half Moon Bay46 mg/LSoft
- Pacifica70 mg/LModerately hard
- Hillsborough36 mg/LSoft
- Millbrae44 mg/LSoft
- Burlingame31 mg/LSoft
- San Bruno44 mg/LSoft
- San Mateo35 mg/LSoft
- Belmont37 mg/LSoft
- San Carlos33 mg/LSoft
- South San Francisco64 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (utility report, July 9, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.