Edelweiss Mountain Improvement Assoc, 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
Edelweiss Mountain Improvement Assoc serves about 70 people through 75 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Pennington County, South Dakota. EPA system ID: SD4600273; phone on file: 6057864366. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Edelweiss Mountain Improvement Assoc's lead record
That is up 11 ppb from 3 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Edelweiss Mountain Improvement Assoc is 14 ppb across 3 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 14 ppb over 10 |
| 2021 | 3 ppb |
| 2018 | 7 ppb |
How Edelweiss Mountain Improvement Assoc 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. Edelweiss Mountain Improvement Assoc's 14 ppb sits at the 100th percentile in South Dakota and the 99th nationally (higher means more lead).
Other water systems in Pennington County
64 other systems share Pennington County; 0 of them have a higher latest lead result than Edelweiss Mountain Improvement Assoc. 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 |
| Rapid Valley Sanitary District | 11,408 | 3 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 |
Your move
Test your own tap with a certified lab first-draw sample; Black Hawk, 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 Edelweiss Mountain Improvement Assoc 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. See what changes at 10 ppb in 2027.