Corydon Water Supply, IA
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2021-2023). 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.
Corydon Water Supply at a glance
Corydon Water Supply serves about 1,610 people through 850 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 surface water, in Wayne County, Iowa. EPA system ID: IA9334078; phone on file: 641-872-1826. They can tell you what your service line is made of and whether they pay to replace it.
Corydon Water Supply's lead record
That is down 1.8 ppb from 1.8 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Corydon Water Supply is 1.8 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 1.8 ppb |
| 2017 | 0 (not detected) |
How Corydon Water Supply compares
Of the 1,066 Iowa systems with a lead result, the median latest reading is 1.4 ppb; 4 are over 15 ppb right now and 36 have gone over at some point. Corydon Water Supply's reported as 0 (not detected) sits at the 26th percentile in Iowa and the 29th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Neighbouring systems
4 other systems share Wayne County; 2 of them have a higher latest lead result than Corydon Water Supply. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Seymour Municipal Utility Water Dept | 637 | 3.4 ppb |
| Humeston Water Plant | 465 | 1.2 ppb |
| Allerton Water Works | 430 | 0 (not detected) |
| Lineville Water Supply | 250 | 0 (not detected) |
Next steps for Corydon, IA
Look up your address in Corydon Water Supply'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 Corydon Water Supply 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.