Water Quality in 50401 — Mason City, IA
EPA data for MASON CITY WATER DEPARTMENT
Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026
Your Water System
ZIP code 50401 in Mason City, Iowa is served by MASON CITY WATER DEPARTMENT (EPA ID: IA1750048). This system provides water to approximately 27,338 people from groundwater sources.
Lead & Copper in Your Water
No Lead & Copper Rule sampling data available for systems serving this ZIP code.
Violation Summary
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| June 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| June 1, 2024 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| June 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| June 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for water systems serving this ZIP code:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 4 | No |
Need help with your water quality?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
What You Can Do
- Review your annual Consumer Confidence Report (CCR) — Your utility publishes this each July
- Test your home’s water — Especially if you have older plumbing (pre-1986) that may contain lead
- Stay informed — Bookmark this page to check for updates on your water quality
Need help with water testing or filtration?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Other Water Quality Reports in Iowa
- 50002 (Adair) — 40 violations
- 50003 (Adel) — 15 violations
- 50005 (Albion) — 3 violations
- 50006 (Alden)
- 50008 (Allerton) — 1 violation
- 50009 (Altoona) — 9 violations
- 50010 (Ames) — 6 violations
- 50020 (Anita) — 1 violation
- 50021 (Ankeny) — 3 violations
- 50022 (Atlantic)
- 50025 (Audubon)
- 50027 (Barnes City) — 4 violations
- 50028 (Baxter) — 13 violations
- 50029 (Bayard) — 7 violations
- 50032 (Berwick)
- 50034 (Blairsburg)
- 50035 (Bondurant)
- 50036 (Boone) — 3 violations
- 50039 (Bouton) — 8 violations
- 50042 (Brayton) — 3 violations
Nearby Water Quality Reports
- 50525 (Clarion) — 40 mi
- 50006 (Alden) — 45 mi
- 50034 (Blairsburg) — 51 mi
- 50613 (Cedar Falls) — 57 mi — 9 violations
- 50701 (Waterloo) — 63 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for MASON CITY WATER DEPARTMENT (IA1750048) on EPA.gov.
Frequently Asked Questions
Is the tap water in 50401 safe to drink?
Based on EPA records, the water system serving ZIP code 50401 has only monitoring/reporting violations, which are procedural in nature. However, individual home conditions (old pipes, well water) can affect quality.
Where does 50401’s water come from?
The primary water source for this area is groundwater. MASON CITY WATER DEPARTMENT serves approximately 27,338 people.
How can I get my water tested?
Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.
Does 50401 have lead in the water?
No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 50401. If you are concerned about lead, contact your water utility or have your tap water independently tested.
What is the radon risk in 50401?
Radon zone data is not available for ZIP code 50401. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.