Rapid Valley Sanitary District, SD
Lead detected, under the action levels
Latest 90th-percentile lead: 3 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.
Rapid Valley Sanitary District at a glance
Rapid Valley Sanitary District serves about 11,408 people through 4,563 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Pennington County, South Dakota. EPA system ID: SD4600274; phone on file: 6053931050. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Rapid Valley Sanitary District's lead record
Against the period ending 2021 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Rapid Valley Sanitary District is 3 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 3 ppb |
| 2021 | 2 ppb |
| 2018 | 3 ppb |
How Rapid Valley Sanitary District 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. Rapid Valley Sanitary District's 3 ppb sits at the 81st percentile in South Dakota and the 83rd nationally (higher means more lead).
Neighbouring systems
64 other systems share Pennington County; 13 of them have a higher latest lead result than Rapid Valley Sanitary District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rapid City | 72,009 | 6 ppb |
| Box Elder | 14,000 | 2 ppb |
| Ellsworth Afb | 9,100 | 1 ppb |
| Colonial Pine Hills Sanitary Distric | 1,200 | 1 ppb |
| Chapel Lane Water Company | 1,200 | 2 ppb |
| Hill City | 872 | 1 ppb |
| Wall | 699 | 1 ppb |
| New Underwood | 679 | 1 ppb |
| Hisega Meadows Water Inc | 493 | 1 ppb |
| Hart Ranch | 468 | 1 ppb |
Next steps for Rapid City, SD
Test your own tap with a certified lab first-draw sample; Rapid City, 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 Rapid Valley Sanitary District 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.