Rosa Joint Ventures Water System, CO
Lead detected, under the action levels
Latest 90th-percentile lead: 3.6 ppb (monitoring period 2024-2026). 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 Rosa Joint Ventures Water System
Rosa Joint Ventures Water System serves about 239 people through 82 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in San Juan County, Colorado. EPA system ID: NM3500324; phone on file: 970-883-2331. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Rosa Joint Ventures Water System's lead record
That is up 1.6 ppb from 2 ppb in the period ending 2018. The highest 90th-percentile result EPA holds for Rosa Joint Ventures Water System is 3.6 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.6 ppb |
| 2018 | 2 ppb |
| 2017 | 0 (not detected) |
Against other Colorado systems
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. Rosa Joint Ventures Water System's 3.6 ppb sits at the 87th percentile in Colorado and the 86th nationally (higher means more lead).
Other water systems in San Juan County
3 other systems share San Juan County; 1 of them has a higher latest lead result than Rosa Joint Ventures Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Silverton Town Of | 2,387 | 2.1 ppb |
| La Vida Mission Community Water Supply | 200 | 0 (not detected) |
| Pine River Mdca | 43 | 7.1 ppb |
Next steps for Ignacio, CO
Test your own tap with a certified lab first-draw sample; Ignacio, 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 Rosa Joint Ventures Water System 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.