Platte, SD
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 14 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. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Who runs the water here
Platte serves about 1,256 people through 692 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Charles Mix County, South Dakota. EPA system ID: SD4600246; phone on file: 6053373921. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2021 (13 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Platte is 14 ppb across 3 monitoring periods, none of them over 15 ppb (2 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 14 ppb over 10 |
| 2021 | 13 ppb over 10 |
| 2018 | 8 ppb |
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. Platte's 14 ppb sits at the 100th percentile in South Dakota and the 99th nationally (higher means more lead).
Nearby utilities
5 other systems share Charles Mix County; 0 of them have a higher latest lead result than Platte. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Randall Community Water District | 6,248 | 4 ppb |
| Wagner | 1,490 | 1 ppb |
| Lake Andes | 710 | 2 ppb |
| Pickstown | 230 | 0 (not detected) |
| Lakeview Colony | 118 | 0 (not detected) |
Next steps for Platte, SD
Test your own tap with a certified lab first-draw sample; Platte, 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 Platte 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. See what changes at 10 ppb in 2027.