Water Quality in WATERLOO, IA (50703)

EPA violation data for public water systems serving ZIP code 50703.

100

Total Violations

Health-Based

Monitoring / Reporting

Resolved

What does this mean?

94 of 100 violations have been resolved. 12 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 88 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.

Water systems: 10 Population served: 2,291

Violations Detail (100 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Public Notice	Monitoring	N/A	N/A	Jan 7, 2025	Active	N/A
Public Notice	Monitoring	N/A	N/A	Jan 7, 2025	Active	N/A
Public Notice	Monitoring	N/A	N/A	Jan 7, 2025	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 31, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 24, 2024	Active	N/A
Public Notice	Monitoring	N/A	N/A	May 24, 2024	Active	N/A
Public Notice	Monitoring	N/A	N/A	May 24, 2024	Active	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 23, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 23, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 23, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 23, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 20, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 25, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 25, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 25, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 25, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Sep 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Sep 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Sep 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Sep 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 20, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 20, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jan 22, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jan 22, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jan 22, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jan 22, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2022	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Public Notice	Monitoring	N/A	N/A	Mar 7, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 7, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 7, 2021	Resolved	N/A

Violation Timeline

2025(3)

Public Notice

Jan 7Active

Public Notice

Jan 7Active

Public Notice

Jan 7Active

2024(11)

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Public Notice

May 24Active

Public Notice

May 24Active

Public Notice

May 24Active

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

2023(72)

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Public Notice

Dec 23Resolved

Public Notice

Dec 23Resolved

Public Notice

Dec 23Resolved

Public Notice

Dec 23Resolved

Public Notice

Nov 20Resolved

Public Notice

Nov 20Resolved

Public Notice

Nov 20Resolved

Public Notice

Nov 20Resolved

Revised Total Coliform Rule

Oct 31Resolved

Revised Total Coliform Rule

Oct 31Resolved

Revised Total Coliform Rule

Oct 31Resolved

Revised Total Coliform Rule

Oct 31Resolved

Public Notice

Oct 30Resolved

Public Notice

Oct 30Resolved

Public Notice

Oct 30Resolved

Public Notice

Oct 30Resolved

Public Notice

Oct 30Resolved

Public Notice

Oct 30Resolved

Public Notice

Oct 30Resolved

Public Notice

Oct 30Resolved

Public Notice

Oct 25Resolved

Public Notice

Oct 25Resolved

Public Notice

Oct 25Resolved

Public Notice

Oct 25Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Public Notice

Sep 20Resolved

Public Notice

Sep 20Resolved

Public Notice

Sep 20Resolved

Public Notice

Sep 20Resolved

Public Notice

Aug 20Resolved

Public Notice

Aug 20Resolved

Public Notice

Aug 20Resolved

Public Notice

Aug 20Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Public Notice

Jan 22Resolved

Public Notice

Jan 22Resolved

Public Notice

Jan 22Resolved

Public Notice

Jan 22Resolved

How Does This Compare?

WATERLOO (50703) has 100 recorded violations, including 12 health-based. 6 remain unresolved. Consider testing your tap water independently for added peace of mind.

Recommended Water Filters

Based on the contaminants detected in your area, these filter types may help improve your water quality.

Reverse Osmosis System

One of the few filtration methods effective at removing nitrates and nitrites. Essential for households with infants.

Targets:Nitrate, Nitrite, Dissolved Solids

Look for:NSF/ANSI 58 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

UV Water Purifier

Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.

Targets:E. coli, Coliform, Giardia, Cryptosporidium

Look for:NSF/ANSI 55 (Class A) certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Always look for filters certified by NSF International for the specific contaminants you want to remove.

Water Quality in WATERLOO, IA (50703)

What does this mean?

Violations Detail (100 total)

Violation Timeline

2025(3)

2024(11)

2023(72)

2022(5)

2021(9)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

UV Water Purifier

Nearby ZIP Codes

Check Another ZIP Code