Hamilton Public Water System, OH
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2027). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Hamilton Public Water System at a glance
Hamilton Public Water System serves about 62,447 people through 24,433 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Butler County, Ohio. EPA system ID: OH0904012. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
That is down 2 ppb from 2 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Hamilton Public Water System is 5.3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2027 | 0 (not detected) |
| 2024 | 2 ppb |
| 2021 | 5.3 ppb |
| 2018 | 2.95 ppb |
Where this result ranks
Of the 1,079 Ohio systems with a lead result, the median latest reading is 0.7 ppb; 1 are over 15 ppb right now and 27 have gone over at some point. Hamilton Public Water System's reported as 0 (not detected) sits at the 44th percentile in Ohio and the 40th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
11 other systems share Butler County; 10 of them have a higher latest lead result than Hamilton Public Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Butler Co. Water District 2 Pws | 116,572 | 3 ppb |
| Middletown City Pws | 51,229 | 1.14 ppb |
| Fairfield City Pws | 44,907 | 0 (not detected) |
| Southwest Regional Water District | 42,856 | 1.4 ppb |
| Oxford City Pws | 24,000 | 2.4 ppb |
| Monroe City Pws | 15,600 | 0.61 ppb |
| Trenton City Pws | 13,012 | 2.5 ppb |
| New Miami Village Pws | 3,200 | 1.1 ppb |
| Catalina Mobile Home Park | 1,280 | 0.7 ppb |
| Seven Mile Village Pws | 1,000 | 1.9 ppb |
Next steps for Fairfield, OH
Look up your address in Hamilton Public Water System's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Hamilton Public Water System whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. Why sampled homes are the worst-case ones is in the guide to reading the number. Small systems behave differently: why small systems go over more often.