Pattison 500, WA
Lead detected, under the action levels
Latest 90th-percentile lead: 3.1 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.
About Pattison 500
Pattison 500 serves about 4,643 people through 1,865 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Thurston County, Washington. EPA system ID: WA5366578. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2021 (2.5 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Pattison 500 is 3.1 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 3.1 ppb |
| 2021 | 2.5 ppb |
| 2018 | 2.8 ppb |
Against other Washington systems
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. Pattison 500's 3.1 ppb sits at the 82nd percentile in Washington and the 83rd nationally (higher means more lead).
Other water systems in Thurston County
195 other systems share Thurston County; 62 of them have a higher latest lead result than Pattison 500. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Olympia City Of | 126,966 | 3.4 ppb |
| Lacey Water Department | 105,178 | 6 ppb |
| Tumwater City Of | 51,924 | 8 ppb |
| Yelm City Of | 17,355 | 1.9 ppb |
| Tanglewilde Thompson Place 600 | 7,900 | 2.8 ppb |
| Grand Mound | 3,764 | 0 (not detected) |
| Tenino City Of | 3,336 | 9 ppb |
| Rainier Water Department | 3,103 | 3.4 ppb |
| Meadows 690 | 3,100 | 5.9 ppb |
| Clearwood | 2,956 | 12.6 ppb |
Next steps for Lacey, WA
Test your own tap with a certified lab first-draw sample; Lacey, 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 Pattison 500 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Size matters more than most people expect: small vs large water systems.