Total Trihalomethanes (TTHM) in Ohio Drinking Water
Ohio has 16,365 public water systems. 8941 have recorded total trihalomethanes (tthm) violations.
Total Systems
16,365
With Violations
8,941
EPA MCL
0.08
Population Served
11.1M
Total Trihalomethanes (TTHM) in Ohio: Key Facts
Total Water Systems
16,365
Systems with Violations
8,941
Lead Violations
223
Copper Violations
1,665
EPA Standard
0.08 mg/L
Water Systems with Violations in Ohio
| System | Population | Violations |
|---|---|---|
| RISINGSUN CHRISTIAN SCHOOL | 25 | 2808 |
| LAMP LIGHTERS VILLAGE PWS | 60 | 2374 |
| SONRISE CHURCH | 50 | 1786 |
| SANDY BEACH TRAILER PARK | 100 | 1644 |
| FRONTIER CAMPGROUND | 100 | 1580 |
| THE MARFO COMPANY | 90 | 1447 |
| WHISPERING WINDS MHC | 100 | 1429 |
| WOODBURY APARTMENTS PWS | 120 | 1407 |
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 Ohio water?
Ohio has 16,365 public water systems. 8941 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 Ohio 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