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
| Rank | System | Population Served | Positive test results of total reported tests | Average Level (Range) |
|---|---|---|---|---|
| 1 | Melody Oaks Trailer Park Jackson, CA | 120 | 2 of 2 | 2085 ppb (1930 to 2240 ppb) |
| 2 | Korths Pirates Lair Isleton, CA | 40 | 3 of 3 | 1633.33 ppb (1520 to 1740 ppb) |
| 3 | Winterhaven Wd Winterhaven, CA | 1,050 | 1 of 1 | 1550 ppb (1550 ppb) |
| 4 | Bella Lago Mobile Home Park Kelseyville, CA | 25 | 2 of 2 | 1450 ppb (1400 to 1500 ppb) |
| 5 | Shamrock Mobile Home Park Santa Rosa, CA | 248 | 1 of 1 | 1400 ppb (1400 ppb) |
| 6 | Mobile Home Estates Santa Rosa, CA | 320 | 1 of 1 | 1300 ppb (1300 ppb) |
| 7 | Meyers Water Co. Napa, CA | 260 | 1 of 1 | 1200 ppb (1200 ppb) |
| 8 | Palmer Creek Csd Fortuna, CA | 350 | 2 of 2 | 1200 ppb (1100 to 1300 ppb) |
| 9 | Cal 20 Village Upper Lake, CA | 150 | 30 of 30 | 1200 ppb (880 to 1600 ppb) |
| 10 | Melody Woods Water Company Los Gatos, CA | 168 | 7 of 7 | 1138.57 ppb (440 to 2200 ppb) |
Health Based Limits for Manganese
| Standard | Description | Level |
|---|---|---|
| EPA Human Health Water Quality Criteria | Water 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 Regulations | A 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 risk | Concentration 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 Level | A 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 exposure | Concentration 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 exposure | Concentration 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 Level | A 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 Type | Number of Violations |
|---|---|
| Failure to monitor regularly | 21 |
| Over maximum contaminant level, Single Sample | 9 |
| Failure to monitor: Check/Repeat/Confirmation sampling | 1 |