Combined Locks 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 Combined Locks Waterworks
Combined Locks Waterworks serves about 3,609 people through 1,433 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Outagamie County, Wisconsin. EPA system ID: WI4450409. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2020 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Combined Locks Waterworks is 1.3 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 | 1.3 ppb |
Against other Wisconsin systems
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. Combined Locks Waterworks's reported as 0 (not detected) sits at the 16th percentile in Wisconsin and the 34th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
18 other systems share Outagamie County; 15 of them have a higher latest lead result than Combined Locks Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Appleton Waterworks | 74,511 | 1.3 ppb |
| Grand Chute Tn San Dist 1 | 21,583 | 3.1 ppb |
| Kaukauna Utilities | 17,493 | 2.4 ppb |
| Darboy Sanitary Dist 1 | 13,024 | 0.47 ppb |
| Little Chute Waterworks | 12,168 | 8.6 ppb |
| Greenville Utilities Vil Of | 11,340 | 7.5 ppb |
| Kimberly Waterworks | 7,608 | 13 ppb |
| Seymour Waterworks | 3,601 | 1.7 ppb |
| Freedom Sanitary District | 3,260 | 1.5 ppb |
| Hortonville Water Utility | 3,028 | 2.7 ppb |
Your move
Look up your address in Combined Locks 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 Combined Locks 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. Why sampled homes are the worst-case ones is in the guide to reading the number. A zero today does not rule out a jump later - the rules are tightening in 2027.