Randolph Water Dept, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 1.3 ppb (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. 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.
Randolph Water Dept at a glance
Randolph Water Dept serves about 1,800 people through 666 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 Columbia County, Wisconsin. EPA system ID: WI1110125. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is down 3.8 ppb from 5.1 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Randolph Water Dept is 8 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 1.3 ppb |
| 2020 | 5.1 ppb |
| 2017 | 8 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. Randolph Water Dept's 1.3 ppb sits at the 49th percentile in Wisconsin and the 61st nationally (higher means more lead).
Other water systems in Columbia County
22 other systems share Columbia County; 16 of them have a higher latest lead result than Randolph Water Dept. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Portage Waterworks | 10,437 | 6.2 ppb |
| Columbus Utilities | 5,173 | 8.88 ppb |
| Wisconsin Dells Waterworks | 3,232 | 1.7 ppb |
| Lodi Waterworks | 3,146 | 18 ppb |
| Poynette Waterworks | 2,520 | 3.05 ppb |
| Pardeeville Waterworks | 2,151 | 1.7 ppb |
| Harmony Grove San Dist | 1,950 | 3.2 ppb |
| Fall River Waterworks | 1,793 | 0.93 ppb |
| Rio Waterworks | 1,095 | 1.4 ppb |
| Arlington Waterworks | 946 | 2 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Randolph, WI 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 Randolph Water Dept 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. Size matters more than most people expect: small vs large water systems.