Ridgewood 609, WA
Exceeded the action level in the past
Latest 90th-percentile lead: 1.2 ppb (monitoring period 2021-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Who runs the water here
Ridgewood 609 serves about 191 people through 72 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 Thurston County, Washington. EPA system ID: WA5372414. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
That is down 168.4 ppb from 169.6 ppb in the period ending 2019. The highest 90th-percentile result EPA holds for Ridgewood 609 is 169.6 ppb across 3 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 1.2 ppb |
| 2019 | 169.6 ppb over 15 |
| 2016 | 4 ppb |
How Ridgewood 609 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. Ridgewood 609's 1.2 ppb sits at the 54th percentile in Washington and the 58th nationally (higher means more lead).
Neighbouring systems
195 other systems share Thurston County; 119 of them have a higher latest lead result than Ridgewood 609. 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 |
| Pattison 500 | 4,643 | 3.1 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 |
What to do in your house
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 Ridgewood 609 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. Why an old exceedance still matters: over the limit before, under it now.