Newdale Colony, SD
Lead detected, under the action levels
Latest 90th-percentile lead: 5 ppb (monitoring period 2025-2025). 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.
Newdale Colony at a glance
Newdale Colony serves about 119 people through 31 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Brookings County, South Dakota. EPA system ID: SD4602081; phone on file: 6055424351. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 3 ppb from 2 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Newdale Colony is 7 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5 ppb |
| 2022 | 2 ppb |
| 2019 | 2 ppb |
| 2017 | 5 ppb |
| 2016 | 7 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. Newdale Colony's 5 ppb sits at the 89th percentile in South Dakota and the 91st nationally (higher means more lead).
Neighbouring systems
10 other systems share Brookings County; 1 of them has a higher latest lead result than Newdale Colony. 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 |
| Kingbrook I Rural Water System | 6,455 | 2 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) |
| Red Willow Colony | 93 | 0 (not detected) |
| North Brookings Water And Sanitary D | 48 | 3 ppb |
| Southbrook Estates | 28 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Elkton, 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 Newdale Colony 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.