Total Trihalomethanes (TTHM) in Louisiana Drinking Water
Louisiana has 5,089 public water systems. 3016 have recorded total trihalomethanes (tthm) violations.
Total Systems
5,089
With Violations
3,016
EPA MCL
0.08
Population Served
5.3M
Total Trihalomethanes (TTHM) in Louisiana: Key Facts
Total Water Systems
5,089
Systems with Violations
3,016
Lead Violations
40
Copper Violations
200
EPA Standard
0.08 mg/L
Water Systems with Violations in Louisiana
| System | Population | Violations |
|---|---|---|
| EAST MOORINGSPORT WATER SYSTEM | 0 | 2267 |
| TOWN OF FERRIDAY WATER SYSTEM | 4K | 2042 |
| EAST COVE UTILITIES | 450 | 1843 |
| FAIRVIEW UNION WATER SYSTEM | 2K | 1589 |
| HUDSON GAARS MILL WATER SYSTEM | 660 | 1416 |
| S AND J RV PARK | 87 | 1286 |
| VILLAGE OF SIKES WATER SYSTEM | 639 | 1279 |
| VILLAGE OF CALVIN WATER SYSTEM | 591 | 1195 |
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 Louisiana water?
Louisiana has 5,089 public water systems. 3016 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 Louisiana 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