Cass County Pwsd 9, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 1.01 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.
Cass County Pwsd 9 at a glance
Cass County Pwsd 9 serves about 6,063 people through 2,461 service connections, which makes it a medium-sized 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: MO1024118. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
That is down 2.43 ppb from 3.44 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Cass County Pwsd 9 is 3.44 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.01 ppb |
| 2022 | 3.44 ppb |
| 2022 | 3.44 ppb |
| 2019 | 1.24 ppb |
| 2019 | 1.24 ppb |
| 2016 | 0 (not detected) |
| 2016 | 0 (not detected) |
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. Cass County Pwsd 9's 1.01 ppb sits at the 50th percentile in Missouri and the 56th nationally (higher means more lead).
Nearby utilities
29 other systems share Cass County; 10 of them have a higher latest lead result than Cass County Pwsd 9. 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 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) |
| Cass County Pwsd 5 | 2,875 | 1.69 ppb |
Next steps for Harrisonville, MO
Test your own tap with a certified lab first-draw sample; Harrisonville, 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 Cass County Pwsd 9 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.