Humboldt Municipal Water Dept, IA
Lead detected, under the action levels
Latest 90th-percentile lead: 1 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.
Humboldt Municipal Water Dept at a glance
Humboldt Municipal Water Dept serves about 4,792 people through 2,058 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 surface water, in Humboldt County, Iowa. EPA system ID: IA4641064; phone on file: 515-332-3435. They can tell you what your service line is made of and whether they pay to replace it.
Humboldt Municipal Water Dept's lead record
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Humboldt Municipal Water Dept is 1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
Where this result ranks
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. Humboldt Municipal Water Dept's 1 ppb sits at the 44th percentile in Iowa and the 55th nationally (higher means more lead).
Nearby utilities
7 other systems share Humboldt County; 6 of them have a higher latest lead result than Humboldt Municipal Water Dept. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Dakota City Water Supply | 769 | 1 ppb |
| Livermore Water Supply | 383 | 6 ppb |
| Bode Municipal Water Supply | 304 | 5 ppb |
| Renwick Munic Water Supply | 234 | 2 ppb |
| Thor Water Works | 181 | 4 ppb |
| Rutland Water Supply | 116 | 2 ppb |
| Ottosen Water Supply | 41 | 12 ppb |
Next steps for Humboldt, IA
Test your own tap with a certified lab first-draw sample; Humboldt, IA 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 Humboldt Municipal Water Dept 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. Systems that went over once often dip back under; here is what that means.