Maple Bluff Waterworks, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 2.79 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.
About Maple Bluff Waterworks
Maple Bluff Waterworks serves about 1,342 people through 497 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 Dane County, Wisconsin. EPA system ID: WI1130234. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
That is up 1.18 ppb from 1.61 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Maple Bluff Waterworks is 2.79 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 2.79 ppb |
| 2020 | 1.61 ppb |
| 2017 | 1.76 ppb |
How Maple Bluff 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. Maple Bluff Waterworks's 2.79 ppb sits at the 72nd percentile in Wisconsin and the 79th nationally (higher means more lead).
Nearby utilities
42 other systems share Dane County; 18 of them have a higher latest lead result than Maple Bluff Waterworks. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Madison Water Utility | 272,000 | 1.8 ppb |
| Sun Prairie Utilities | 39,300 | 2.8 ppb |
| Fitchburg Utility Dist 1 | 29,900 | 2.3 ppb |
| Middleton Waterworks | 23,868 | 4 ppb |
| Waunakee Waterworks | 14,879 | 1.7 ppb |
| Verona Waterworks | 14,030 | 2.86 ppb |
| Stoughton Waterworks | 13,078 | 4.2 ppb |
| Oregon Waterworks | 11,200 | 4.97 ppb |
| Deforest Waterworks | 10,500 | 5.95 ppb |
| Mcfarland Waterworks | 9,676 | 2.1 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Madison, 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 Maple Bluff 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. The action level is dropping - the 10 ppb rule from 2027.