Greene Co.-Northwest Reg Water, OH
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. 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.
Who runs the water here
Greene Co.-Northwest Reg Water serves about 41,895 people through 16,597 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 groundwater, in Greene County, Ohio. EPA system ID: OH2903512; phone on file: 937-562-7102. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Greene Co.-Northwest Reg Water is 6.1 ppb across 11 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2025 | 3.1 ppb |
| 2024 | 2.5 ppb |
| 2023 | 4.2 ppb |
| 2022 | 3.5 ppb |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2019 | 6.1 ppb |
| 2018 | 4.11 ppb |
| 2017 | 5.04 ppb |
How Greene Co.-Northwest Reg Water compares
Of the 1,079 Ohio systems with a lead result, the median latest reading is 0.7 ppb; 1 are over 15 ppb right now and 27 have gone over at some point. Greene Co.-Northwest Reg Water's reported as 0 (not detected) sits at the 43rd percentile in Ohio and the 39th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Greene County
16 other systems share Greene County; 11 of them have a higher latest lead result than Greene Co.-Northwest Reg Water. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Fairborn Public Water System | 34,620 | 3.1 ppb |
| Xenia City Pws | 29,000 | 1.2 ppb |
| Wright-Patterson Afb Area A Pws | 16,551 | 0 (not detected) |
| Wright-Patterson Afb Area B Pws | 11,034 | 0 (not detected) |
| Bellbrook Water Works | 9,475 | 4.3 ppb |
| Wright State University | 8,948 | 3.1 ppb |
| Greene County Eastern Regional Pws | 4,800 | 0 (not detected) |
| Cedarville University | 4,000 | 3.4 ppb |
| Yellow Springs Village Pws | 3,761 | 4.2 ppb |
| Jamestown Village Pws | 1,997 | 1.8 ppb |
Your move
Look up your address in Greene Co.-Northwest Reg Water'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 Greene Co.-Northwest Reg Water 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. A zero today does not rule out a jump later - the rules are tightening in 2027.