Tri-County Water District, ND
Lead detected, under the action levels
Latest 90th-percentile lead: 1.16 ppb (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. 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.
Tri-County Water District at a glance
Tri-County Water District serves about 2,501 people through 995 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Nelson County, North Dakota. EPA system ID: ND3201072; phone on file: 701-345-8595. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Tri-County Water District's lead record
That is down 2.26 ppb from 3.42 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Tri-County Water District is 3.42 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1.16 ppb |
| 2021 | 3.42 ppb |
| 2018 | 2.8 ppb |
Against other North Dakota systems
Of the 300 North Dakota systems with a lead result, the median latest reading is 0.91 ppb; 3 are over 15 ppb right now and 20 have gone over at some point. Tri-County Water District's 1.16 ppb sits at the 55th percentile in North Dakota and the 58th nationally (higher means more lead).
Other water systems in Nelson County
5 other systems share Nelson County; 2 of them have a higher latest lead result than Tri-County Water District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Lakota City Of | 672 | 7.74 ppb |
| Mcville City Of | 349 | 0 (not detected) |
| Michigan City Of | 294 | 1.9 ppb |
| Aneta City Of | 222 | 0 (not detected) |
| Tolna City Of | 166 | 0 (not detected) |
Next steps for Petersburg, ND
Test your own tap with a certified lab first-draw sample; Petersburg, ND 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 Tri-County Water District 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.