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National Drinking Water Database


Total trihalomethanes (TTHMs) in New Mexico


Total trihalomethanes constitute the sum of four disinfection byproducts: chloroform, bromodichloromethane, dibromochloromethane, and bromoform. [read more]

The Most Polluted Communities in New Mexico

334 water utilities reported detecting Total trihalomethanes (TTHMs) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Total trihalomethanes (TTHMs) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Miami Water Users Association
Miami, NM
1509 of 9132.01 ppb
(80.1 to 182 ppb)
2Springer Water System
Springer, NM
2,00012 of 12111.84 ppb
(32.12 to 223.56 ppb)
3Big Mesa Water Mdwca
Conchas Dam, NM
4505 of 5104.17 ppb
(80.34 to 119.5 ppb)
4Philmont Boy Scout Ranch - Headquarters
Cimarron, NM
2,2309 of 989.3 ppb
(48.2 to 133.4 ppb)
5Tularosa Water System
Tularosa, NM
3,5006 of 670.62 ppb
(35.52 to 120 ppb)
6Navajo Dam Domestic Water Consumers Inc
Navajo Dam, NM
5928 of 870.03 ppb
(29.51 to 143.99 ppb)
7San Acacia Mdwca
San Acacia, NM
1526 of 769.84 ppb
(0 to 129 ppb)
8Lee Acres Water Users Association
Farmington, NM
4,9004 of 469.06 ppb
(44.77 to 93.97 ppb)
9Upper LA Plata Water Users Association
Elephant Butte, NM
2,3009 of 967.82 ppb
(44 to 115.7 ppb)
10West Hammond Mdwca
Bloomfield, NM
3,8754 of 467.48 ppb
(39.24 to 108 ppb)

Health Based Limits for Total trihalomethanes (TTHMs)

StandardDescriptionLevel
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.9.8 ppb
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.11.5 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.80 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.130 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.980 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.1835 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.4860 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.10600 ppb

Violation Summary for Total trihalomethanes (TTHMs) in New Mexico

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

Violation TypeNumber of Violations
Monitoring and Reporting Disinfection Byproduct Rule50
Over maximum contaminant level, Average49
Failure to monitor: Check/Repeat/Confirmation sampling1