Hillsboro, City Of, OR
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 Hillsboro, City Of
Hillsboro, City Of serves about 92,632 people through 28,385 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Washington County, Oregon. EPA system ID: OR4101513; phone on file: 503-615-6579. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is down 1.1 ppb from 1.1 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Hillsboro, City Of is 1.1 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 0 (not detected) |
| 2021 | 1.1 ppb |
| 2018 | 1 ppb |
Against other Oregon systems
Of the 909 Oregon systems with a lead result, the median latest reading is 1 ppb; 15 are over 15 ppb right now and 71 have gone over at some point. Hillsboro, City Of's reported as 0 (not detected) sits at the 38th percentile in Oregon and the 40th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
28 other systems share Washington County; 18 of them have a higher latest lead result than Hillsboro, City Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Tualatin Valley Water District | 224,600 | 5.3 ppb |
| Beaverton, City Of | 88,045 | 2.6 ppb |
| Tigard, City Of | 62,500 | 0.98 ppb |
| Tualatin, City Of | 28,106 | 4.93 ppb |
| Forest Grove, City Of | 26,838 | 3.6 ppb |
| Sherwood, City Of | 20,781 | 1.3 ppb |
| Cornelius, City Of | 14,490 | 0 (not detected) |
| West Slope Water District | 11,000 | 5.01 ppb |
| Raleigh Water District | 4,500 | 5.01 ppb |
| North Plains Water Department | 3,663 | 0 (not detected) |
Next steps for Hillsboro, OR
Look up your address in Hillsboro, City Of'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 Hillsboro, City Of 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. Small systems behave differently: why small systems go over more often.