City and town drinking water records

Water systems serving Charter Oak, CA

2 community water systems have a mapped service area in Charter Oak, CA. Three Valleys MWD covers 90% of the area inside Charter Oak's Census boundary.

None of them had a health-based violation in the last 10 years.

2 rely mainly on surface water, counting water bought from other systems.

Their lead service line inventories list no lead lines, no galvanized lines that must be replaced and no lines of unknown material.

Community water systems: 2
Systems with a health-based violation, last 10 years: 0
Systems with one unresolved: 0
Lead service lines in inventories: 0

Water systems serving Charter Oak

2 systems

People served is each system's own figure for its whole service area. Violation counts cover the last 10 years of EPA records.

System	Area	People served	Main source	Health-based violations, 10 years	Unresolved	Lead lines
Three Valleys MWD	Covers 90% of Charter Oak	Not reported	Surface water	0	0	0
GSWC-San Dimas	Covers 90% of Charter Oak	56,538	Purchased surface water	0	0	0

Other cities and towns in Los Angeles County

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Back to Los Angeles County, CA

Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations