Community Water System · PWS MD0300002
City of Baltimore
Operator location Baltimore, Maryland - 27% of 73 violations are health-based (upper-third health share (> 23%)); surface water source; 1,600,000 served per SDWIS.
- 1,600,000
- People served (this PWS)
- 73
- EPA violations (this PWS)
- 20
- Health-based (this PWS)
- 1 PFAS
- UCMR5 (this PWS)
City of Baltimore standing, mid SDWIS violation third
27% of 73 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 27% is upper-third health share (> 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #10 of 29,740 among systems serving 500+.
The verdict
City of Baltimore lands in the middle third by violation volume (73), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (1,600,000; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 27% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)).
- #10 of 29,740
- Population · /systems
- #2 of 437
- Population · MD
- 73
- Total EPA violations on record
- 27%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 424,600
- County
- Baltimore city
- School/Daycare
- No
- MCL Violations
- 13
- Monitoring Violations
- 43
- Treatment Tech Violations
- 7
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MCL | 9 | 2016 |
| Chlordane | MR | 8 | 2023 |
| Toxaphene | MR | 8 | 2023 |
| Revised Total Coliform Rule | MCL | 4 | 2022 |
| Nitrate | MR | 4 | 2023 |
| Surface Water Treatment Rule | TT | 4 | 2000 |
| Interim Enhanced Surface Water Treatment Rule | TT | 3 | 2009 |
| Interim Enhanced Surface Water Treatment Rule | MR | 2 | 2007 |
| Public Notice | Other | 2 | 2022 |
| cis-1,2-Dichloroethylene | MR | 1 | 2015 |
| Xylenes, Total | MR | 1 | 2015 |
| o-Dichlorobenzene | MR | 1 | 2015 |
| p-Dichlorobenzene | MR | 1 | 2015 |
| Vinyl chloride | MR | 1 | 2015 |
| 1,1-Dichloroethylene | MR | 1 | 2015 |
| 1,2-Dichloroethane | MR | 1 | 2015 |
| Carbon tetrachloride | MR | 1 | 2015 |
| 1,2-Dichloropropane | MR | 1 | 2015 |
| Trichloroethylene | MR | 1 | 2015 |
| Tetrachloroethylene | MR | 1 | 2015 |
| Benzene | MR | 1 | 2015 |
| Toluene | MR | 1 | 2015 |
| Ethylbenzene | MR | 1 | 2015 |
| CHLOROBENZENE | MR | 1 | 2015 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2015 |
| trans-1,2-Dichloroethylene | MR | 1 | 2015 |
| 1,1,1-Trichloroethane | MR | 1 | 2015 |
| DICHLOROMETHANE | MR | 1 | 2015 |
| Styrene | MR | 1 | 2015 |
| 1,1,2-Trichloroethane | MR | 1 | 2015 |
Violation Count vs. the National Corpus
City of Baltimore has 73 recorded EPA violations, 66% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 34% carry more. 27% of this system's own violations are health-based (20 of 73), and it ranks #10 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)
73 Around the middle fewer violations than 34% 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. 1 of 348 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFBS | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 8/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 8/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/29/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| NFDHA | 8/29/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMBA | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 8/29/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 8/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/29/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/29/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 8/29/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/15/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 6:2 FTS | 8/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/15/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMPA | 8/15/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 8/15/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTA | 8/15/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/15/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 8/15/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 8/15/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 8/15/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFOA | 8/15/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 4:2 FTS | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/15/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 8/15/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on City of Baltimore
20 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MD0300002.
Sources: EPA SDWIS
Nationwide peers
73 violations · 1,600,000 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 City of Baltimore
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Maryland compares on the same EPA violation measures. Maryland 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.