Rendezvous Ranch, SD
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (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. 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 Rendezvous Ranch
Rendezvous Ranch serves about 195 people through 78 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: SD4602210; phone on file: 6057864366. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Rendezvous Ranch's lead record
Against the period ending 2022 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Rendezvous Ranch is 1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 1 ppb |
| 2019 | 1 ppb |
| 2016 | 1 ppb |
How Rendezvous Ranch 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. Rendezvous Ranch's 1 ppb sits at the 26th percentile in South Dakota and the 52nd nationally (higher means more lead).
Other water systems in Lawrence County
41 other systems share Lawrence County; 20 of them have a higher latest lead result than Rendezvous Ranch. 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 |
| Lantern Estates | 192 | 3 ppb |
| Walnut Park | 180 | 2 ppb |
Next steps for Black Hawk, SD
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 Rendezvous Ranch 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. The action level is dropping - the 10 ppb rule from 2027.