Spearfish Valley Mobile Estates, 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.
About Spearfish Valley Mobile Estates
Spearfish Valley Mobile Estates serves about 163 people through 65 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Lawrence County, South Dakota. EPA system ID: SD4600625. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is up 2 ppb from 1 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Spearfish Valley Mobile Estates is 3 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 3 ppb |
| 2021 | 1 ppb |
| 2018 | 3 ppb |
How Spearfish Valley Mobile 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. Spearfish Valley Mobile Estates's 3 ppb sits at the 75th percentile in South Dakota and the 81st nationally (higher means more lead).
Neighbouring systems
41 other systems share Lawrence County; 5 of them have a higher latest lead result than Spearfish Valley Mobile Estates. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Spearfish | 13,803 | 3 ppb |
| Lead | 2,982 | 1 ppb |
| Deadwood | 1,156 | 2 ppb |
| Whitewood | 879 | 1 ppb |
| Terry Trojan Water District | 400 | 4 ppb |
| Mountain Plains 2 Homeowners Assoc | 268 | 1 ppb |
| Saint Onge Sewer & Water Co | 255 | 2 ppb |
| Boulder Park Water Users Association | 200 | 1 ppb |
| Rendezvous Ranch | 195 | 1 ppb |
| Lantern Estates | 192 | 3 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Spearfish, 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 Spearfish Valley Mobile Estates 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. Systems that went over once often dip back under; here is what that means.