Brookfield Water Utility, WI
Lead detected, under the action levels
Latest 90th-percentile lead: 1.5 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 Brookfield Water Utility
Brookfield Water Utility serves about 29,070 people through 10,766 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Waukesha County, Wisconsin. EPA system ID: WI2680253. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2020 (1.6 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Brookfield Water Utility is 13 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 1.5 ppb |
| 2020 | 1.6 ppb |
| 2019 | 2.5 ppb |
| 2016 | 13 ppb over 10 |
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. Brookfield Water Utility's 1.5 ppb sits at the 54th percentile in Wisconsin and the 64th nationally (higher means more lead).
Other water systems in Waukesha County
71 other systems share Waukesha County; 27 of them have a higher latest lead result than Brookfield Water Utility. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Waukesha Water Utility | 70,718 | 0.56 ppb |
| New Berlin Water Utility | 27,899 | 0.33 ppb |
| Menomonee Falls Ww - Surface Water | 23,867 | 2.1 ppb |
| Oconomowoc Waterworks | 15,805 | 6.8 ppb |
| Sussex Village Hall & Water Utility | 11,750 | 1.8 ppb |
| Hartland Waterworks | 9,212 | 4.2 ppb |
| Pewaukee City Water And Sewer Utility | 8,671 | 2.6 ppb |
| Mukwonago Waterworks | 8,190 | 3.2 ppb |
| Pewaukee Village Waterworks | 8,166 | 1 ppb |
| Muskego Water Utility | 8,150 | 3.89 ppb |
Next steps for Brookfield, WI
Test your own tap with a certified lab first-draw sample; Brookfield, 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 Brookfield Water Utility 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. Size matters more than most people expect: small vs large water systems.