Rio Grande Water Company, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 3 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 Rio Grande Water Company
Rio Grande Water Company serves about 265 people through 100 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Rio Grande County, Colorado. EPA system ID: CO0253860; phone on file: 719-873-9710. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 3 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Rio Grande Water Company is 3 ppb across 15 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 3 ppb |
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 2 ppb |
| 2023 | 0.5 ppb |
| 2022 | 2 ppb |
| 2021 | 2 ppb |
| 2021 | 1.3 ppb |
| 2020 | 2 ppb |
| 2020 | 0 (not detected) |
| 2019 | 2 ppb |
| 2018 | 1 ppb |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Rio Grande Water Company compares
Of the 1,025 Colorado systems with a lead result, the median latest reading is 1 ppb; 2 are over 15 ppb right now and 71 have gone over at some point. Rio Grande Water Company's 3 ppb sits at the 82nd percentile in Colorado and the 81st nationally (higher means more lead).
Neighbouring systems
7 other systems share Rio Grande County; 0 of them have a higher latest lead result than Rio Grande Water Company. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Monte Vista City Of | 4,600 | 0 (not detected) |
| Del Norte Town Of | 1,429 | 1 ppb |
| South Fork West Municipal Town Of | 566 | 0 (not detected) |
| Riviere Estates | 211 | 0 (not detected) |
| Indian Trails Water Llc | 110 | 1.5 ppb |
| Pacheco Trailer Park | 36 | - |
| G And M Mobile Home Park | 30 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; South Fork, CO 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 Rio Grande Water Company 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. Size matters more than most people expect: small vs large water systems.