Sphinx Mountain Mb Hm Pk, MT
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2022-2024). 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.
Sphinx Mountain Mb Hm Pk at a glance
Sphinx Mountain Mb Hm Pk serves about 52 people through 19 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: MT0003755; phone on file: 406-848-9200. 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 2018 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Sphinx Mountain Mb Hm Pk is 0 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2018 | 0 (not detected) |
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. Sphinx Mountain Mb Hm Pk's reported as 0 (not detected) sits at the 9th percentile in Montana and the 4th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
14 other systems share Park County; 11 of them have a higher latest lead result than Sphinx Mountain Mb Hm Pk. 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 |
| Avalon Subdivision | 135 | 0.44 ppb |
| Windmill Trailer Park Well 2 | 125 | 0 (not detected) |
What to do in your house
Look up your address in Sphinx Mountain Mb Hm Pk'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 Sphinx Mountain Mb Hm Pk 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.