Rio Vista Estates Hoa Assoc Inc, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 3 ppb (monitoring period 2025-2027). 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.
Who runs the water here
Rio Vista Estates Hoa Assoc Inc serves about 50 people through 29 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Carbon County, Montana. EPA system ID: MT0004480. Ask the utility on your bill for your address in their service line inventory.
Rio Vista Estates Hoa Assoc Inc's lead record
Against the period ending 2021 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Rio Vista Estates Hoa Assoc Inc is 3.6 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2027 | 3 ppb |
| 2021 | 2 ppb |
| 2018 | 1.5 ppb |
| 2017 | 3.6 ppb |
How Rio Vista Estates Hoa Assoc Inc compares
Of the 753 Montana systems with a lead result, the median latest reading is 1 ppb; 5 are over 15 ppb right now and 28 have gone over at some point. Rio Vista Estates Hoa Assoc Inc's 3 ppb sits at the 80th percentile in Montana and the 81st nationally (higher means more lead).
Neighbouring systems
11 other systems share Carbon County; 2 of them have a higher latest lead result than Rio Vista Estates Hoa Assoc Inc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Red Lodge Water Dept | 2,000 | 3 ppb |
| Bridger Town Of | 750 | 4 ppb |
| Joliet Town Of | 600 | 3 ppb |
| Fromberg Town Of | 498 | 5 ppb |
| Roberts Wua Carbon Co Water And Sewer | 300 | 0 (not detected) |
| Belfry Carbon Co Water And Sewer Dist | 205 | 1 ppb |
| Bearcreek Municipal Water Sys | 200 | 3 ppb |
| Vwa Services | 93 | 0 (not detected) |
| Cooney Enterprises | 50 | 0 (not detected) |
| Evergreen Subdivision | 45 | 2 ppb |
Next steps for Laurel, MT
Test your own tap with a certified lab first-draw sample; Laurel, MT 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 Vista Estates Hoa Assoc Inc 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.