City and town drinking water records

Water systems serving Antioch, CA

2 community water systems have a mapped service area in Antioch, CA. Contra Costa Water District covers 97% of the area inside Antioch's Census boundary and reports serving 198,000 people in all.

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 Antioch

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
Contra Costa Water District	Covers 97% of Antioch	198,000	Surface water	0	0	0
City of Antioch	Covers 92% of Antioch	115,074	Surface water	0	0	0

Other cities and towns in Contra Costa County

51 places

Back to Contra Costa 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