The Power of Information

National Drinking Water Database


Manganese in California


Manganese is a naturally occurring element released from mineral deposits as well as industrial use.

The Most Polluted Communities in California

1,020 water utilities reported detecting Manganese in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Manganese level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Melody Oaks Trailer Park
Jackson, CA
1202 of 22085 ppb
(1930 to 2240 ppb)
2Korths Pirates Lair
Isleton, CA
403 of 31633.33 ppb
(1520 to 1740 ppb)
3Winterhaven Wd
Winterhaven, CA
1,0501 of 11550 ppb
(1550 ppb)
4Bella Lago Mobile Home Park
Kelseyville, CA
252 of 21450 ppb
(1400 to 1500 ppb)
5Shamrock Mobile Home Park
Santa Rosa, CA
2481 of 11400 ppb
(1400 ppb)
6Mobile Home Estates
Santa Rosa, CA
3201 of 11300 ppb
(1300 ppb)
7Meyers Water Co.
Napa, CA
2601 of 11200 ppb
(1200 ppb)
8Palmer Creek Csd
Fortuna, CA
3502 of 21200 ppb
(1100 to 1300 ppb)
9Cal 20 Village
Upper Lake, CA
15030 of 301200 ppb
(880 to 1600 ppb)
10Melody Woods Water Company
Los Gatos, CA
1687 of 71138.57 ppb
(440 to 2200 ppb)

Health Based Limits for Manganese

StandardDescriptionLevel
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.50 ppb
National Secondary Drinking Water RegulationsA National Secondary Drinking Water Regulation is a non-enforceable guideline regarding contaminants that may cause cosmetic effects (such as taste, odor, or color). Some states choose to adopt them as enforceable standards. Source: U.S. Environmental Protection Agency. 50 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.300 ppb
Health-Based Screening LevelA benchmark concentration of contaminants in water that may be of potential concern for human health, if exceeded. For noncarcinogens, the HBSL represents the contaminant concentration in drinking water that is not expected to cause any adverse effects over a lifetime of exposure. For carcinogens, the HBSL range represents the contaminant concentration in drinking water that corresponds to an excess estimated lifetime cancer risk of 1 chance in 1 million to 1 chance in 10 thousand. Source: U.S. Geological Survey.300 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.1000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.1600 ppb

Violation Summary for Manganese 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 regularly21
Over maximum contaminant level, Single Sample9
Failure to monitor: Check/Repeat/Confirmation sampling1