Johnsons Mobile Home Park, MT
Lead detected, under the action levels
Latest 90th-percentile lead: 5 ppb (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. 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
Johnsons Mobile Home Park serves about 35 people through 14 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Lincoln County, Montana. EPA system ID: MT0000529; phone on file: 406-291-5417. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 2 ppb from 7 ppb in the period ending 2019. The highest 90th-percentile result EPA holds for Johnsons Mobile Home Park is 7 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5 ppb |
| 2019 | 7 ppb |
| 2016 | 3 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. Johnsons Mobile Home Park's 5 ppb sits at the 92nd percentile in Montana and the 90th nationally (higher means more lead).
Nearby utilities
17 other systems share Lincoln County; 1 of them has a higher latest lead result than Johnsons Mobile Home Park. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Libby City Of | 4,892 | 2 ppb |
| Troy City Of | 2,100 | 2 ppb |
| Eureka Town Of | 1,995 | 1 ppb |
| Indian Springs Ranch Sub | 455 | 0 (not detected) |
| Wilderness Club The | 440 | 0 (not detected) |
| Wilderness Plateau Water And Sewer Dist | 208 | 2 ppb |
| Pinewood Village | 160 | 4 ppb |
| Rexford Town Of | 160 | 0 (not detected) |
| Emkayan Village Co Water And Sewer Dist | 160 | 2 ppb |
| Angel Island Subdivision | 150 | 0 (not detected) |
Next steps for Libby, MT
Test your own tap with a certified lab first-draw sample; Libby, 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 Johnsons Mobile Home Park 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. The action level is dropping - the 10 ppb rule from 2027.