Southbrook Estates, SD
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
About Southbrook Estates
Southbrook Estates serves about 28 people through 8 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: SD4600072. Ask the utility on your bill for your address in their service line inventory.
Southbrook Estates's lead record
Against the period ending 2018 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Southbrook Estates is 3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2018 | 1 ppb |
| 2017 | 2 ppb |
| 2016 | 3 ppb |
How Southbrook Estates compares
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. Southbrook Estates's reported as 0 (not detected) sits at the 0th percentile in South Dakota and the 1st nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Brookings County
10 other systems share Brookings County; 8 of them have a higher latest lead result than Southbrook Estates. 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) |
| Newdale Colony | 119 | 5 ppb |
| Red Willow Colony | 93 | 0 (not detected) |
| North Brookings Water And Sanitary D | 48 | 3 ppb |
Your move
Look up your address in Southbrook Estates's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Southbrook Estates whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1400 ppb (copper action level 1,300 ppb).
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. Small systems behave differently: why small systems go over more often.