State Hub
Missouri Water Quality
652
Utilities in database
5.5M
Residents served
0
With open violations
224
PFAS monitored
Quick Answer
Missouri public drinking water is served by 652 EPA-tracked water systems, providing service to approximately 5.5 million residents through public utilities. No open health-based violations are currently recorded across tracked systems in the EPA federal database. 224 systems have official PFAS monitoring records from the EPA UCMR 5 program (2023–2025). About 30% of MO residents use private wells, which fall outside federal utility compliance monitoring.
No open health-based violations are currently recorded in the EPA SDWIS database for Missouri's tracked water systems. Always verify with your utility's Consumer Confidence Report for annual test results.
Drinking Water in Missouri
Missouri has 652 community water systems serving approximately 5.5 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, arsenic, nitrates. 30% of Missouri residents rely on private wells. MoDNR holds primary enforcement authority under the Safe Drinking Water Act.
Safest Large Utilities
Missouri systems with no open health violations serving 10,000+ residents.
Utilities in Missouri
176–200 of 652Herculaneum Pws
MO6010359 · 4,227 served
Butler Pws
MO1010118 · 4,219 served
Bowling Green Pws
MO2010093 · 4,195 served
Cass County Pwsd 7
MO1024111 · 4,143 served
Brookfield Pws
MO2010105 · 4,111 served
Jackson County Pwsd 16
MO1020869 · 4,075 served
Centralia Pws
MO3010152 · 4,027 served
Audrain County Consolidated Pwsd 2
MO2024014 · 4,016 served
Pulaski County Pwsd 1
MO3024490 · 4,000 served
Camdenton Pws
MO3010130 · 3,960 served
Knox County Public Water & Sewer Dist 1
MO2024313 · 3,947 served
St James Pws
MO3010712 · 3,935 served
Grundy County Pwsd 1
MO2024237 · 3,900 served
Montgomery Co Pwsd 1
MO6024406 · 3,850 served
Harrison County Pwsd 2
MO1024242 · 3,740 served
Johnson County Pwsd 1
MO1024309 · 3,730 served
Ste Genevieve County Pwsd 1 Sc
MO4024543 · 3,718 served
Malden Pws
MO4010490 · 3,706 served
Ashland Pws
MO3010033 · 3,700 served
Clinton County Pwsd 3
MO1024155 · 3,615 served
Palmyra Pws
MO2010623 · 3,595 served
El Dorado Springs Pws
MO5010241 · 3,593 served
Andrew County Pwsd 2
MO1024005 · 3,580 served
St Charles Co Pwsd #2 Wright City
MO6010874 · 3,550 served
Bonne Terre Pws
MO4010087 · 3,537 served
Key Contaminant Concerns in Missouri
These contaminants appear most frequently in Missouri utility records or pose elevated risk in this region based on EPA data.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always caused by human activity — nitrate is converted in the digestive system to nitrite, which then reacts with hemoglobin to form methemoglobin, a form of hemoglobin that cannot carry oxygen. In the body, nitrite also reacts with amines in food to form N-nitroso compounds (nitrosamines) — known carcinogens classified by the IARC as Group 2A (probable human carcinogens). The United States applies over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination in U.S. groundwater.
EPA limit: 10 mg/L
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
EPA limit: 80 µg/L (TTHMs) / 60 µg/L (HAA5)
Arsenic
Arsenic (As) occurs naturally in rock and soil, dissolving into groundwater through natural weathering processes. Inorganic arsenic — the form found in drinking water — is a known human carcinogen. The western United States has particularly arsenic-rich geological formations, but elevated levels have been found in 48 states. Arsenic is tasteless and odorless.
EPA limit: 10 ppb
City Water Reports in Missouri
Tap water quality pages for Missouri cities — violations, PFAS records, utility profiles, and official source links.
Independent Water Testing
Find a certified lab in Missouri
Utility compliance records show what water systems report to the EPA. An independent test from a certified laboratory confirms what's actually in your tap water. Missouri labs can test for PFAS, lead, nitrates, bacteria, and dozens of other contaminants.
Explore Water Quality in Missouri
Herculaneum Pws
Violation history, PFAS records, and official source links
Butler Pws
Violation history, PFAS records, and official source links
Bowling Green Pws
Violation history, PFAS records, and official source links
PFAS monitoring records — Missouri
224 water systems in Missouri with EPA UCMR 5 records
Lead in Missouri drinking water
State-specific lead data, violation utilities, and testing guidance
PFAS in Missouri drinking water
State-specific PFAS data, MCL context, and treatment options
Certified water testing labs in Missouri
Labs certified for PFAS (EPA 533/537.1), lead, and bacteria testing
Water treatment options
Reverse osmosis, activated carbon, and filtration guides with cost ranges
Data sources and methodology
How WaterUtilityReport.com sources and validates official EPA data
Common Questions About Missouri Drinking Water
Does Missouri drinking water have PFAS?
224 Missouri water systems have EPA UCMR 5 PFAS monitoring records (2023–2025)
Which Missouri water utilities have open violations?
Browse Missouri utility compliance records and violation history
How do I test my water in Missouri?
State-certified labs for PFAS (EPA 533/537.1), lead, nitrate, and bacteria testing
What treatment removes PFAS from MO tap water?
Reverse osmosis removes PFAS, lead, arsenic, and nitrates — cost, maintenance, and NSF certification explained
What do Missouri PFAS records tell me about my water?
EPA limits, health context, and what UCMR 5 detection above MRL means for your water
How is Missouri water quality data sourced here?
EPA SDWIS violations, UCMR 5 PFAS records, and CCR data — sources, accuracy notes, and limitations
Missouri Water FAQs
Data sources: Utility compliance and violation data from EPA SDWIS (Safe Drinking Water Information System). PFAS monitoring records from EPA UCMR 5 (Unregulated Contaminant Monitoring Rule 5, 2023–2025). Contaminant data from EPA and ATSDR public references. This page summarizes public records — it is not a compliance determination. Methodology →
Last updated: 2026-04-19