Sheffield Water Supply, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
About Sheffield Water Supply
Sheffield Water Supply serves about 1,130 people through 506 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Franklin County, Iowa. EPA system ID: IA3570037; phone on file: 641-892-4718. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sheffield Water Supply is 3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 0 (not detected) |
| 2019 | 1 ppb |
| 2016 | 3 ppb |
Where this result ranks
Of the 1,066 Iowa systems with a lead result, the median latest reading is 1.4 ppb; 4 are over 15 ppb right now and 36 have gone over at some point. Sheffield Water Supply's 1 ppb sits at the 43rd percentile in Iowa and the 54th nationally (higher means more lead).
Other water systems in Franklin County
8 other systems share Franklin County; 6 of them have a higher latest lead result than Sheffield Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Hampton Muni Water Works | 4,337 | 6.2 ppb |
| Latimer Water Supply | 477 | 2 ppb |
| Coulter Water Supply | 219 | 2 ppb |
| Alexander Water Dept | 164 | 0 (not detected) |
| Geneva Water Works | 136 | 2 ppb |
| Hansell Water Department | 82 | 4 ppb |
| Beeds Lake Home Owners Association | 75 | 0 (not detected) |
| Dorell Drive Home Owners Association | 32 | 4 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Sheffield, IA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Sheffield Water Supply 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Systems that went over once often dip back under; here is what that means.