Kingbrook I Rural Water System, SD
Lead detected, under the action levels
Latest 90th-percentile lead: 2 ppb (monitoring period 2024-2024). 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 Kingbrook I Rural Water System
Kingbrook I Rural Water System serves about 6,455 people through 2,750 service connections, which makes it a medium-sized system under EPA's size classes. It is privately owned and draws groundwater, in Brookings County, South Dakota. EPA system ID: SD4600431; phone on file: 6059835074. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2021 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Kingbrook I Rural Water System is 4 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 2 ppb |
| 2021 | 2 ppb |
| 2018 | 4 ppb |
Where this result ranks
Of the 458 South Dakota systems with a lead result, the median latest reading is 2 ppb; 0 are over 15 ppb right now and 6 have gone over at some point. Kingbrook I Rural Water System's 2 ppb sits at the 71st percentile in South Dakota and the 72nd nationally (higher means more lead).
Neighbouring systems
10 other systems share Brookings County; 4 of them have a higher latest lead result than Kingbrook I Rural Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Brookings Municipal Utilities | 23,377 | 8 ppb |
| Volga | 2,340 | 2 ppb |
| Aurora | 1,200 | 2 ppb |
| Elkton | 755 | 4 ppb |
| White | 499 | 2 ppb |
| University Estates | 150 | 0 (not detected) |
| Newdale Colony | 119 | 5 ppb |
| Red Willow Colony | 93 | 0 (not detected) |
| North Brookings Water And Sanitary D | 48 | 3 ppb |
| Southbrook Estates | 28 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Arlington, SD 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 Kingbrook I Rural Water System 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.