Barnett Water Users System, 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.
About Barnett Water Users System
Barnett Water Users System serves about 70 people through 29 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: MT0003183; phone on file: 406-461-5718. 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 Barnett Water Users System is 6 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 6 ppb |
How Barnett Water Users System 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. Barnett Water Users System's reported as 0 (not detected) sits at the 12th percentile in Montana and the 6th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Lewis And Clark County
50 other systems share Lewis And Clark County; 34 of them have a higher latest lead result than Barnett Water Users System. 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 |
Your move
Look up your address in Barnett Water Users 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 Barnett Water Users 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.