Cape San Juan Water District, WA
Lead detected, under the action levels
Latest 90th-percentile lead: 5.1 ppb (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. 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.
Cape San Juan Water District at a glance
Cape San Juan Water District serves about 164 people through 145 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 San Juan County, Washington. EPA system ID: WA5311065. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
That is up 2.3 ppb from 2.8 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Cape San Juan Water District is 5.1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 5.1 ppb |
| 2022 | 2.8 ppb |
| 2019 | 3.5 ppb |
| 2016 | 2 ppb |
How Cape San Juan Water District compares
Of the 2,218 Washington systems with a lead result, the median latest reading is 1 ppb; 18 are over 15 ppb right now and 62 have gone over at some point. Cape San Juan Water District's 5.1 ppb sits at the 92nd percentile in Washington and the 91st nationally (higher means more lead).
Neighbouring systems
39 other systems share San Juan County; 4 of them have a higher latest lead result than Cape San Juan Water District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Eastsound Water Users Association | 3,711 | 5.3 ppb |
| Friday Harbor Town Of | 3,543 | 1.6 ppb |
| Roche Harbor Water System Inc | 2,091 | 3.3 ppb |
| Rosario | 1,426 | 4.5 ppb |
| Fisherman Bay Water Association | 1,195 | 0 (not detected) |
| Doe Bay Water Users Assoc | 442 | 3.3 ppb |
| Olga Water Users Inc | 392 | 3.1 ppb |
| West Sound Water Association | 206 | 1.6 ppb |
| Oaks The Mobile Home Park | 143 | 1.1 ppb |
| Mackaye Harbor Water District | 133 | 1.5 ppb |
Next steps for Friday Harbor, WA
Test your own tap with a certified lab first-draw sample; Friday Harbor, WA 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 Cape San Juan 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. The action level is dropping - the 10 ppb rule from 2027.