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National Drinking Water Database


Manganese in Texas


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

The Most Polluted Communities in Texas

2,489 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)
1Bammel Forest Utility Co
Spring, TX
9902 of 2652 ppb
(214 to 1090 ppb)
2Clear Water Cove Inc
Willis, TX
2252 of 2401.3 ppb
(32.6 to 770 ppb)
3EL Paso County Wcid 4 Fabens
Fabens, TX
3393 of 3354.67 ppb
(164 to 468 ppb)
4Riverboat Bend Trailer Park
Dayton, TX
1412 of 2351.5 ppb
(351 to 352 ppb)
5Oak Shores Water System
Montague, TX
3092 of 2319.5 ppb
(319 to 320 ppb)
6Quail Oak Subdivision
Houston, TX
331 of 1288 ppb
(288 ppb)
7Ryan Long Subdivision 2 Water System
Rosharon, TX
543 of 3279.3 ppb
(41.3 to 720 ppb)
8Powers Water System
Sweeny, TX
721 of 1265 ppb
(265 ppb)
9Hoe Wsc
Tomball, TX
3602 of 2255 ppb
(251 to 259 ppb)
10City of Trinidad
Trinidad, TX
1,7435 of 5253.87 ppb
(2.7 to 1250 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 Texas

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

Violation TypeNumber of Violations
Over maximum contaminant level, Single Sample1