Avalon Subdivision, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 0.44 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 Avalon Subdivision
Avalon Subdivision serves about 135 people through 6 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Park County, Montana. EPA system ID: MT0004802; phone on file: 406-581-5778. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2023 (0.48 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Avalon Subdivision is 8 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0.44 ppb |
| 2023 | 0.48 ppb |
| 2022 | 0 (not detected) |
| 2016 | 8 ppb |
Against other Montana systems
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. Avalon Subdivision's 0.44 ppb sits at the 40th percentile in Montana and the 42nd nationally (higher means more lead).
Neighbouring systems
14 other systems share Park County; 9 of them have a higher latest lead result than Avalon Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Livingston City Of | 9,200 | 2 ppb |
| Gardiner Park Co Water Dist | 700 | 2 ppb |
| Clyde Park Water Dept | 300 | 2.49 ppb |
| Cooke City Water District | 300 | 2 ppb |
| Wilsall Water District | 250 | 2 ppb |
| East Gate Work Camp | 208 | 0 (not detected) |
| Golden Age Village | 180 | 1 ppb |
| Cinnabar The | 175 | 15 ppb |
| Windmill Trailer Park Well 2 | 125 | 0 (not detected) |
| Windmill Trailer Park Well 1 | 110 | 2 ppb |
Next steps for Belgrade, MT
Test your own tap with a certified lab first-draw sample; Belgrade, 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 Avalon 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Systems that went over once often dip back under; here is what that means.