Timberline Estates, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 2 ppb (monitoring period 2026-2026). 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.
About Timberline Estates
Timberline Estates serves about 95 people through 41 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Washington County, Iowa. EPA system ID: IA9260302; phone on file: 319-217-6192. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2025 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Timberline Estates is 8 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2 ppb |
| 2025 | 2 ppb |
| 2024 | 6 ppb |
| 2024 | 2 ppb |
| 2023 | 4 ppb |
| 2020 | 8 ppb |
| 2017 | 2 ppb |
Against other Iowa systems
Of the 1,066 Iowa systems with a lead result, the median latest reading is 1.4 ppb; 4 are over 15 ppb right now and 36 have gone over at some point. Timberline Estates's 2 ppb sits at the 59th percentile in Iowa and the 70th nationally (higher means more lead).
Neighbouring systems
12 other systems share Washington County; 3 of them have a higher latest lead result than Timberline Estates. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Washington Water Department | 7,362 | 0 (not detected) |
| Kalona Water Dept | 2,630 | 1 ppb |
| Wellman Municipal Waterworks | 1,524 | 0 (not detected) |
| Riverside Water Supply | 1,060 | 0 (not detected) |
| Brighton Municipal Water Supply | 600 | 2 ppb |
| Ainsworth Water Works | 511 | 0 (not detected) |
| Crawfordsville Water Supply | 277 | 0 (not detected) |
| West Chester Muni Wtr Supply | 144 | 4 ppb |
| Linn Hollow Mhp Llc | 68 | 5.2 ppb |
| City Of Kalona - Southtown | 60 | 6 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Crawfordsville, IA 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 Timberline Estates whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2100 ppb (copper action level 1,300 ppb).
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. The action level is dropping - the 10 ppb rule from 2027.