Patch Grove 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.
Who runs the water here
Patch Grove Waterworks serves about 160 people through 94 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Grant County, Wisconsin. EPA system ID: WI1220113. Ask the utility on your bill for your address in their service line inventory.
Patch Grove Waterworks's lead record
Against the period ending 2020 (0.65 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Patch Grove Waterworks is 0.65 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 0.65 ppb |
| 2017 | 0.57 ppb |
How Patch Grove Waterworks compares
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. Patch Grove Waterworks's reported as 0 (not detected) sits at the 7th percentile in Wisconsin and the 13th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
27 other systems share Grant County; 19 of them have a higher latest lead result than Patch Grove Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Platteville Waterworks | 12,268 | 10.3 ppb |
| Lancaster Waterworks | 3,907 | 1.8 ppb |
| Boscobel Waterworks | 3,237 | 1.1 ppb |
| Fennimore Waterworks | 2,507 | 1.61 ppb |
| Cuba City Waterworks | 2,141 | 0 (not detected) |
| Muscoda Waterworks | 1,453 | 2.64 ppb |
| Hazel Green Waterworks | 1,193 | 2.83 ppb |
| Dickeyville Waterworks | 1,069 | 0 (not detected) |
| Cassville Waterworks | 777 | 3.24 ppb |
| Montfort Waterworks | 718 | 1.1 ppb |
What to do in your house
Look up your address in Patch Grove 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 Patch Grove 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. A zero today does not rule out a jump later - the rules are tightening in 2027.