Oakfield Waterworks, WI
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2023-2023). 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.
About Oakfield Waterworks
Oakfield Waterworks serves about 1,058 people through 391 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 Fond Du Lac County, Wisconsin. EPA system ID: WI4200475. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2020 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Oakfield Waterworks is 1.2 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2017 | 1.2 ppb |
Where this result ranks
Of the 947 Wisconsin systems with a lead result, the median latest reading is 1.33 ppb; 6 are over 15 ppb right now and 71 have gone over at some point. Oakfield Waterworks's reported as 0 (not detected) sits at the 13th percentile in Wisconsin and the 27th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
14 other systems share Fond Du Lac County; 12 of them have a higher latest lead result than Oakfield Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Fond Du Lac Waterworks | 44,678 | 6.1 ppb |
| Ripon Water Utility | 7,716 | 3.5 ppb |
| North Fond Du Lac Waterworks | 5,414 | 9.1 ppb |
| Campbellsport Waterworks | 1,825 | 1.12 ppb |
| Ashwood Grove Edgewater | 1,046 | 2.4 ppb |
| Fond Du Lac Tn Water Utility | 980 | 3.6 ppb |
| Brandon Waterworks | 872 | 6.86 ppb |
| Mount Calvary Waterworks | 478 | 0.45 ppb |
| St Cloud Waterworks | 471 | 1.9 ppb |
| Fairwater Waterworks | 365 | 1.75 ppb |
What to do in your house
Look up your address in Oakfield Waterworks'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 Oakfield Waterworks 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.