Total Trihalomethanes (TTHM) in Minnesota Drinking Water
Minnesota has 21,775 public water systems. 5018 have recorded total trihalomethanes (tthm) violations.
Total Systems
21,775
With Violations
5,018
EPA MCL
0.08
Population Served
5.3M
Total Trihalomethanes (TTHM) in Minnesota: Key Facts
Total Water Systems
21,775
Systems with Violations
5,018
Lead Violations
109
Copper Violations
393
EPA Standard
0.08 mg/L
Water Systems with Violations in Minnesota
| System | Population | Violations |
|---|---|---|
| GRAND PORTAGE | 820 | 1966 |
| BUG-O-NAY-GE-SHIG SCHOOL GYM | 170 | 1198 |
| BUG-O-NAY-GE-SHIG VOCATIONAL SCHOOL | 180 | 1161 |
| NETT LAKE | 386 | 527 |
| NAYTAHWAUSH | 462 | 480 |
| CHIPPEWA RANCH | 25 | 460 |
| RICE LAKE | 65 | 459 |
| ELBOW LAKE | 50 | 408 |
Health Effects of Total Trihalomethanes (TTHM) Exposure
Cancer risk
Long-term exposure increases bladder cancer risk
Reproductive effects
Some evidence of adverse pregnancy outcomes
Liver/kidney stress
High chronic exposure may stress liver and kidneys
Long-term exposure: increased risk of cancer (bladder). Some evidence of reproductive effects.
Frequently Asked Questions
Is there total trihalomethanes (tthm) in Minnesota water?
Minnesota has 21,775 public water systems. 5018 have recorded total trihalomethanes (tthm) violations based on EPA SDWIS data. If you are on a private well, your water is not covered by these regulations and should be tested independently.
How can I check my Minnesota water for total trihalomethanes (tthm)?
Search for your water system using the WaterCheck system lookup, or contact your utility and request a copy of your Consumer Confidence Report (CCR). The CCR is published annually and lists all detected contaminants, their levels, and the EPA MCLs. For private wells, contact a state-certified lab for independent testing.
What is the EPA limit for total trihalomethanes (tthm)?
The EPA Maximum Contaminant Level (MCL) for total trihalomethanes (tthm) is 0.08 mg/L. Systems that exceed MCLs are required to notify customers and take corrective action.
Total Trihalomethanes (TTHM) at a Glance
Source
Byproduct of drinking water chlorination; reaction of chlorine with organic matter
How to Filter Total Trihalomethanes (TTHM)
- +Activated carbon filters reduce TTHMs effectively
- +Reverse osmosis also removes TTHMs
- +Letting water sit uncovered may reduce some volatile TTHMs