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Public water system

Alameda County Water District

PWSID CA0110001 - Alameda County, California

72 PPM
4.2 GPG
Slightly Hard
0Soft60120180300+
Slightly Hard (72 PPM)Verified - State Lab Tested

System Details

Water source
surface water
Population served
344,000
Service connections
86,959
Status
Active

Hardness Evidence

Reported hardness
72 PPM
Grains per gallon
4.2 GPG
Data source
California treated-water report
Source year
2024
Raw/source estimate
170 PPM

Linked City Reports

Coast Guard Isla, CAAlameda, CAFremont, CAHayward, CACastro Valley, CALivermore, CANewark, CAPleasanton, CADublin, CASan Leandro, CASan Lorenzo, CASunol, CAUnion City, CAOakland, CAEmeryville, CAPiedmont, CABerkeley, CAAlbany, CAKensington, CA

Served ZIP Codes

ZIPLocationZIP average
94501Coast Guard Isla, CASlightly Hard (91 PPM)
94502Alameda, CASlightly Hard (91 PPM)
94536Fremont, CASlightly Hard (91 PPM)
94538Fremont, CASlightly Hard (91 PPM)
94539Fremont, CASlightly Hard (91 PPM)
94541Hayward, CASlightly Hard (91 PPM)
94542Hayward, CASlightly Hard (91 PPM)
94544Hayward, CASlightly Hard (91 PPM)
94545Hayward, CASlightly Hard (91 PPM)
94546Castro Valley, CASlightly Hard (91 PPM)
94550Livermore, CASlightly Hard (91 PPM)
94552Castro Valley, CASlightly Hard (91 PPM)
94555Fremont, CASlightly Hard (91 PPM)
94560Newark, CASlightly Hard (91 PPM)
94566Pleasanton, CASlightly Hard (91 PPM)
94568Dublin, CASlightly Hard (91 PPM)
94577San Leandro, CASlightly Hard (91 PPM)
94578San Leandro, CASlightly Hard (91 PPM)
94579San Leandro, CASlightly Hard (91 PPM)
94580San Lorenzo, CASlightly Hard (91 PPM)
94586Sunol, CASlightly Hard (91 PPM)
94587Union City, CASlightly Hard (91 PPM)
94588Pleasanton, CASlightly Hard (91 PPM)
94601Oakland, CASlightly Hard (91 PPM)
94602Oakland, CASlightly Hard (91 PPM)
94603Oakland, CASlightly Hard (91 PPM)
94605Oakland, CASlightly Hard (91 PPM)
94606Oakland, CASlightly Hard (91 PPM)
94607Oakland, CASlightly Hard (91 PPM)
94608Emeryville, CASlightly Hard (91 PPM)
94609Oakland, CASlightly Hard (91 PPM)
94610Oakland, CASlightly Hard (91 PPM)
94611Piedmont, CASlightly Hard (91 PPM)
94612Oakland, CASlightly Hard (91 PPM)
94618Piedmont, CASlightly Hard (91 PPM)
94619Oakland, CASlightly Hard (91 PPM)
94621Oakland, CASlightly Hard (91 PPM)
94702Berkeley, CASlightly Hard (91 PPM)
94703Berkeley, CASlightly Hard (91 PPM)
94704Berkeley, CASlightly Hard (91 PPM)
94705Berkeley, CASlightly Hard (91 PPM)
94706Albany, CASlightly Hard (91 PPM)
94707Kensington, CASlightly Hard (91 PPM)
94708Kensington, CASlightly Hard (91 PPM)
94709Berkeley, CASlightly Hard (91 PPM)
94710Berkeley, CASlightly Hard (91 PPM)

How to Use This System Page

A public water system can serve multiple ZIP codes and cities. Use this page to inspect the source behind the hardness reading, then open the linked ZIP or city page for the local rollup.

If you are sizing treatment equipment, confirm your actual tap hardness with a home test or lab test before buying.

MethodologySourcesSearch by ZIP