Cass County Pwsd 11, MO
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2024-2026). 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.
Cass County Pwsd 11 at a glance
Cass County Pwsd 11 serves about 1,948 people through 760 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Cass County, Missouri. EPA system ID: MO1021082; phone on file: 816-773-8510. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 1.35 ppb from 1.35 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Cass County Pwsd 11 is 4.44 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 1.35 ppb |
| 2022 | 2.82 ppb |
| 2020 | 2.82 ppb |
| 2019 | 4.44 ppb |
| 2017 | 4.44 ppb |
| 2016 | 3.45 ppb |
How Cass County Pwsd 11 compares
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. Cass County Pwsd 11's reported as 0 (not detected) sits at the 33rd percentile in Missouri and the 30th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Cass County
29 other systems share Cass County; 13 of them have a higher latest lead result than Cass County Pwsd 11. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Belton Pws | 23,598 | 0 (not detected) |
| Raymore Pws | 21,517 | 0 (not detected) |
| Harrisonville Pws | 10,250 | 2.41 ppb |
| Pleasant Hill Pws | 8,262 | 0 (not detected) |
| Peculiar Pws | 6,226 | 0 (not detected) |
| Cass County Pwsd 9 | 6,063 | 1.01 ppb |
| Cass County Pwsd 2 | 4,650 | 4.7 ppb |
| Cass County Pwsd 7 | 4,143 | 2.89 ppb |
| Cass County Pwsd 3 | 3,225 | 0 (not detected) |
| Cass County Pwsd 10 | 3,068 | 0 (not detected) |
Next steps for Garden City, MO
Look up your address in Cass County Pwsd 11'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 Cass County Pwsd 11 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. Small systems behave differently: why small systems go over more often.