The Power of Information

National Drinking Water Database

Lead (total) in California

Lead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits. [read more]

The Most Polluted Communities in California

553 water utilities reported detecting Lead (total) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Lead (total) level

RankSystem Population Served Positive test results of total reported tests Average Level
1Arnold Park (O Bannon S Mhp)
Hollister, CA
282 of 354.67 ppb
(0 to 150 ppb)
2Las Cumbres Mutual Water Co
Los Gatos, CA
3371 of 152 ppb
(52 ppb)
3Cascadel Mutual Water System
North Fork, CA
3002 of 339.08 ppb
(0 to 116 ppb)
4Rural Canyon Mutual Water Company
Forestville, CA
201 of 139 ppb
(39 ppb)
5Sundown Mobile Home Park
Oroville, CA
761 of 125.45 ppb
(25.45 ppb)
6Tucker Acres Mutual Water Co.
Calistoga, CA
2001 of 125 ppb
(25 ppb)
7Blackie RD WS #05
Salinas, CA
541 of 121 ppb
(21 ppb)
8The Oaks Mobile Home Park
Ione, CA
4651 of 120 ppb
(20 ppb)
9San Juan Ranch
Dos Palos, CA
1001 of 120 ppb
(20 ppb)
10Dogwood Blue Jay Cyn Imp
Blue Jay, CA
1601 of 119 ppb
(19 ppb)

Health Based Limits for Lead (total)

Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.0.2 ppb

Violation Summary for Lead (total) in California

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in California since 2004

Violation TypeNumber of Violations
Failure to monitor regularly1