North Geraldine Water System, 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.
North Geraldine Water System at a glance
North Geraldine Water System serves about 50 people through 13 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Chouteau County, Montana. EPA system ID: MT0003521; phone on file: 406-737-4223. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
North Geraldine Water System's lead record
That is down 8 ppb from 8 ppb in the period ending 2019. The highest 90th-percentile result EPA holds for North Geraldine Water System is 8 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2019 | 8 ppb |
| 2016 | 2 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. North Geraldine Water System's reported as 0 (not detected) sits at the 7th 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
10 other systems share Chouteau County; 6 of them have a higher latest lead result than North Geraldine Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Fort Benton City Of | 1,500 | 2 ppb |
| Big Sandy Town Of | 608 | 0 (not detected) |
| Highwood County Water And Sewer District | 280 | 2 ppb |
| Geraldine Town Of | 260 | 3 ppb |
| Loma County Water District | 200 | 1 ppb |
| Carter Chouteau Co Water Dist | 150 | 0 (not detected) |
| South Chouteau County Water Dist | 80 | 2 ppb |
| Sunny Brook Colony | 80 | 0 (not detected) |
| Twin Hills Colony Inc | 78 | 0 (not detected) |
| Hawarden Square Butte Water | 50 | 2 ppb |
What to do in your house
Look up your address in North Geraldine Water System'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 North Geraldine Water System 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. A zero today does not rule out a jump later - the rules are tightening in 2027.