Hammond 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 Hammond Waterworks
Hammond Waterworks serves about 1,884 people through 731 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 St. Croix County, Wisconsin. EPA system ID: WI6560121. Ask the utility on your bill for your address in their service line inventory.
Hammond Waterworks's lead record
That is down 2 ppb from 2 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Hammond Waterworks is 4 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 2 ppb |
| 2017 | 4 ppb |
How Hammond 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. Hammond Waterworks's reported as 0 (not detected) sits at the 15th percentile in Wisconsin and the 30th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in St. Croix County
11 other systems share St. Croix County; 9 of them have a higher latest lead result than Hammond Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Hudson Waterworks | 18,558 | 6.1 ppb |
| New Richmond Waterworks | 10,824 | 1.5 ppb |
| Baldwin Waterworks | 4,440 | 2 ppb |
| Somerset Waterworks | 3,334 | 1.8 ppb |
| Roberts Waterworks | 1,872 | 1 ppb |
| Woodville Waterworks | 1,386 | 0.79 ppb |
| Glenwood City Waterworks | 1,102 | 0 (not detected) |
| Star Prairie Waterworks | 553 | 0.39 ppb |
| Wall Street Village | 191 | 0 (not detected) |
| Wilson Waterworks | 170 | 3.5 ppb |
Your move
Look up your address in Hammond 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 Hammond 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. What a 90th-percentile result does and does not tell you: how to read a lead result. A zero today does not rule out a jump later - the rules are tightening in 2027.