Sourdough Point, ID
Lead detected, under the action levels
Latest 90th-percentile lead: 2.4 ppb (monitoring period 2024-2026). 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
Sourdough Point serves about 178 people through 78 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Bonner County, Idaho. EPA system ID: ID1090129; phone on file: 208-265-4270. They can tell you what your service line is made of and whether they pay to replace it.
Sourdough Point's lead record
That is down 3.6 ppb from 6 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Sourdough Point is 6 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2.4 ppb |
| 2023 | 6 ppb |
| 2020 | 5 ppb |
| 2017 | 6 ppb |
Where this result ranks
Of the 763 Idaho systems with a lead result, the median latest reading is 1 ppb; 3 are over 15 ppb right now and 46 have gone over at some point. Sourdough Point's 2.4 ppb sits at the 75th percentile in Idaho and the 76th nationally (higher means more lead).
Other water systems in Bonner County
49 other systems share Bonner County; 13 of them have a higher latest lead result than Sourdough Point. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Sandpoint Public Works Dept | 12,284 | 4 ppb |
| Priest River City Of | 2,173 | 4 ppb |
| Oden Water Assn Inc | 1,524 | 1 ppb |
| Schweitzer Basin Water Company | 955 | 6 ppb |
| Stoneridge Utilities | 940 | 2 ppb |
| Dover City Of | 865 | 14 ppb |
| Clark Fork City Of | 730 | 2 ppb |
| Sagle Valley Water Dist | 708 | 0 (not detected) |
| Laclede Water Dist | 668 | 2 ppb |
| Southside Water And Sewer Dist | 615 | 4 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Sandpoint, ID 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 Sourdough Point 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. Size matters more than most people expect: small vs large water systems.