Riverside Colony, SD
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Who runs the water here
Riverside Colony serves about 80 people through 25 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Beadle County, South Dakota. EPA system ID: SD4602040; phone on file: 6053527462. They can tell you what your service line is made of and whether they pay to replace it.
Riverside Colony's lead record
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Riverside Colony is 0 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
Against other South Dakota systems
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. Riverside Colony's reported as 0 (not detected) sits at the 1st percentile in South Dakota and the 7th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
5 other systems share Beadle County; 4 of them have a higher latest lead result than Riverside Colony. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Huron | 14,263 | 6 ppb |
| Wolsey | 459 | 3 ppb |
| Hitchcock | 112 | 3 ppb |
| Huron Colony | 95 | 0 (not detected) |
| Pearl Creek Colony | 94 | 1 ppb |
Next steps for Huron, SD
Look up your address in Riverside Colony'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 Riverside 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. The lead result guide covers how utilities pick the homes they sample. Small systems behave differently: why small systems go over more often.