Green Castle Pws, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 9.9 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 Green Castle Pws
Green Castle Pws serves about 212 people through 121 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 surface water, in Sullivan County, Missouri. EPA system ID: MO2010328; phone on file: 660-874-4717. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 8.2 ppb from 1.7 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Green Castle Pws is 9.9 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 9.9 ppb |
| 2022 | 1.7 ppb |
| 2021 | 1.7 ppb |
| 2021 | 1.7 ppb |
| 2019 | 1.16 ppb |
| 2018 | 1.16 ppb |
| 2018 | 1.16 ppb |
| 2016 | 0.55 ppb |
Where this result ranks
Of the 1,674 Missouri systems with a lead result, the median latest reading is 1.04 ppb; 2 are over 15 ppb right now and 74 have gone over at some point. Green Castle Pws's 9.9 ppb sits at the 98th percentile in Missouri and the 97th nationally (higher means more lead).
Nearby utilities
6 other systems share Sullivan County; 0 of them have a higher latest lead result than Green Castle Pws. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Sullivan County Pwsd 1 | 4,412 | 1.14 ppb |
| Milan Pws | 1,759 | 1.05 ppb |
| Green City Pws | 578 | 2.42 ppb |
| Newtown Pws | 109 | 0 (not detected) |
| Humphreys Pws | 98 | 0 (not detected) |
| North Central Mo Regional Water Com | 25 | - |
Your move
Test your own tap with a certified lab first-draw sample; Green Castle, MO 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 Green Castle Pws 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. The action level is dropping - the 10 ppb rule from 2027.