Community Water System · PWS IA0790074
Waterloo Water Works
Operator location Waterloo, Iowa - larger served population (> 3,309) at 69,504 people served; 67 SDWIS violations on record from groundwater sources.
- 69,504
- People served (this PWS)
- 67
- EPA violations (this PWS)
- 12
- Health-based (this PWS)
- 4 PFAS
- UCMR5 (this PWS)
Waterloo Water Works standing, mid SDWIS violation third
69,504 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 18% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #754 of 29,740 among systems serving 500+.
The verdict
Waterloo Water Works lands in the middle third by violation volume (67), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (69,504; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 18% (middle-third health share (≤ 23%)). UCMR5 detected 4 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #754 of 29,740
- Population · /systems
- #6 of 545
- Population · IA
- 67
- Total EPA violations on record
- 18%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 27,430
- County
- Black Hawk
- School/Daycare
- No
- MCL Violations
- 12
- Monitoring Violations
- 47
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 17 | 1993 |
| Lead and Copper Rule | MR | 9 | 2007 |
| 1,1-Dichloroethylene | MR | 9 | 1996 |
| Nitrate | MCL | 8 | 2015 |
| Coliform (TCR) | MCL | 4 | 1992 |
| Coliform (TCR) | MR | 4 | 1996 |
| Arsenic | MR | 2 | 1985 |
| Barium | MR | 1 | 1985 |
| Cadmium | MR | 1 | 1985 |
| Chromium | MR | 1 | 1985 |
| Mercury | MR | 1 | 1985 |
| Fluoride | MR | 1 | 1985 |
| Selenium | MR | 1 | 1985 |
Violation Count vs. the National Corpus
Waterloo Water Works has 67 recorded EPA violations, 64% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 36% carry more. 18% of this system's own violations are health-based (12 of 67), and it ranks #754 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
67 Around the middle fewer violations than 36% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 9 of 522 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHxA | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 9/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 9/23/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 9/23/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFPeS | 9/23/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NMeFOSAA | 9/23/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 9/23/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/23/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 9/23/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 9/23/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFDoA | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/23/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/23/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 9/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 9/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 9/23/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 9/23/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/23/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/28/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/28/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 8/28/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMBA | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 8/28/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 8/28/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 8/28/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 8/28/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFEESA | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 8/28/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 8/28/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/28/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/28/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/28/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/28/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
Population served record for Waterloo Water Works
EPA SDWIS lists 69,504 people served and 27,430 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
67 violations · 69,504 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Waterloo Water Works
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Iowa compares on the same EPA violation measures. Iowa systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.