City and town drinking water records

Water systems serving El Monte, CA

6 community water systems have a mapped service area in El Monte, CA. San Gabriel Valley Water Co.-El Monte covers 58% of the area inside El Monte's Census boundary and reports serving 248,000 people in all.

4 of them had at least one health-based violation in the last 10 years. 3 systems still have one unresolved.

5 rely mainly on groundwater and 1 on surface water, counting water bought from other systems.

4 systems filed a lead service line inventory listing 0 lead lines, 0 galvanized lines that must be replaced and 207 lines of unknown material.

Community water systems: 6
Systems with a health-based violation, last 10 years: 4
Systems with one unresolved: 3
Lead service lines in inventories: 0

Water systems serving El Monte

6 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
San Gabriel Valley Water Co.-El Monte	Covers 58% of El Monte	248,000	Groundwater	2	0	0
El Monte-City, Water Dept.	Covers 21% of El Monte	22,968	Groundwater	0	0	0
Cal/Am Water Company - San Marino	Covers 13% of El Monte	47,995	Purchased surface water	0	0	0
Hemlock Mutual Water Co.	Mapped area inside El Monte	686	Groundwater	1	2	0
Sterling Mutual Water Company	Mapped area inside El Monte	198	Groundwater	1	2	No inventory
Del Rio Mutual	Mapped area inside El Monte	700	Groundwater	1	2	No inventory

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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