Grand Valley Estates Subdivision, MT
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
About Grand Valley Estates Subdivision
Grand Valley Estates Subdivision serves about 50 people through 23 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Lewis And Clark County, Montana. EPA system ID: MT0004474; phone on file: 406-403-4816. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Grand Valley Estates Subdivision is 0 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2018 | 0 (not detected) |
How Grand Valley Estates Subdivision 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. Grand Valley Estates Subdivision's reported as 0 (not detected) sits at the 8th percentile in Montana and the 3rd nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
50 other systems share Lewis And Clark County; 34 of them have a higher latest lead result than Grand Valley Estates Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Helena Water System | 32,091 | 3 ppb |
| East Helena City Of | 2,114 | 1 ppb |
| Eastgate Village Sewer And Water | 2,000 | 1 ppb |
| Va Medical Center Helena | 1,275 | 7 ppb |
| Helena Leisure Llc | 1,200 | 1 ppb |
| Ten Mile And Pleasant Valley Wua | 750 | 0 (not detected) |
| North Star Pud | 715 | 7 ppb |
| Treasure State Acres Wua | 483 | 2 ppb |
| La Casa Grande Water And Sewer District | 404 | 2 ppb |
| Skyview Water And Sewer Utility | 400 | 2 ppb |
Next steps for Helena, MT
Look up your address in Grand Valley Estates Subdivision's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Grand Valley Estates Subdivision 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. Small systems behave differently: why small systems go over more often.