Twin Rivers Subd, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 2.09 ppb (monitoring period 2023-2025). 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 Twin Rivers Subd
Twin Rivers Subd serves about 72 people through 36 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Barry County, Missouri. EPA system ID: MO5036195. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
Against the period ending 2022 (2.77 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Twin Rivers Subd is 2.77 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.09 ppb |
| 2022 | 2.77 ppb |
| 2022 | 2.77 ppb |
| 2019 | 2.25 ppb |
| 2019 | 2.25 ppb |
| 2019 | 0.59 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. Twin Rivers Subd's 2.09 ppb sits at the 72nd percentile in Missouri and the 74th nationally (higher means more lead).
Nearby utilities
29 other systems share Barry County; 3 of them have a higher latest lead result than Twin Rivers Subd. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Monett Pws | 9,789 | 0 (not detected) |
| Cassville Pws | 3,290 | 2.09 ppb |
| Southwest Rural Water District 1 | 2,700 | 1.78 ppb |
| Purdy Pws | 1,100 | 1.21 ppb |
| Seligman Pws | 890 | 0 (not detected) |
| Exeter Pws | 800 | 0 (not detected) |
| Wheaton Pws | 698 | 3.62 ppb |
| Butterfield Pws | 528 | 0.68 ppb |
| Emerald Beach Village Of Pws | 484 | 0.52 ppb |
| Washburn Pws | 448 | 0.52 ppb |
Next steps for Shell Knob, MO
Test your own tap with a certified lab first-draw sample; Shell Knob, 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 Twin Rivers Subd 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. The action level is dropping - the 10 ppb rule from 2027.