Water Quality in GRINNELL, IA (50112)
EPA violation data for public water systems serving ZIP code 50112.
115
Total Violations
47
Health-Based
68
Monitoring / Reporting
108
Resolved
What does this mean?
108 of 115 violations have been resolved. 47 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 68 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.
Violations Detail (115 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Total Haloacetic Acids (HAA5) | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| TTHM | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jul 31, 2025 | Resolved | N/A |
Lead & Copper Levels
Violation Timeline
2025(32)
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Total Haloacetic Acids (HAA5)
27
TTHM
27
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Total Haloacetic Acids (HAA5)
27
Total Haloacetic Acids (HAA5)
27
Consumer Confidence Rule
71
TTHM
27
TTHM
27
TTHM
27
TTHM
27
Total Haloacetic Acids (HAA5)
27
Total Haloacetic Acids (HAA5)
27
Consumer Confidence Rule
71
Total Haloacetic Acids (HAA5)
27
Total Haloacetic Acids (HAA5)
27
Consumer Confidence Rule
71
TTHM
27
TTHM
27
Consumer Confidence Rule
71
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
Revised Total Coliform Rule
3A
2024(41)
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Public Notice
75
Public Notice
75
Public Notice
75
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Gross Alpha, Excl. Radon and U
02
Revised Total Coliform Rule
2A
Revised Total Coliform Rule
2A
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Combined Radium (-226 and -228)
02
Gross Alpha, Excl. Radon and U
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Combined Radium (-226 and -228)
02
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Gross Alpha, Excl. Radon and U
02
Public Notice
75
Public Notice
75
Public Notice
75
How Does This Compare?
GRINNELL (50112) has 115 recorded violations, including 47 health-based. 7 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.
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
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
Always look for filters certified by NSF International for the specific contaminants you want to remove.