waterbycounty
EPA SDWIS

Montgomery County Water Quality

Montgomery County, Missouri

Water Grade

D

Water Score

42.0

Violations

2

State Rank

#63

of 115 (1 = best)

EPA SDWIS Compliance

Drinking Water Quality

Water Quality Grade

D

Based on EPA compliance history and violation data

Water Score

42/100

Higher = better quality

Health Violations

2

Health-based violations

Violation Rate

28.6%

Systems with violations

Water Advisory: Montgomery County

Water Verdict

Montgomery County receives a below-average water quality assessment with a grade of D and a score of 42.0 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Montgomery County has recorded 2 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 28.6 violations per 1,000 residents, this rate is high and signals significant water quality management issues.

Consumer Guidance

Residents of Montgomery County are advised to use filtered or bottled water for drinking and cooking until water quality improves. A reverse-osmosis or activated-carbon filter certified to remove the contaminants listed in the utility's Consumer Confidence Report is recommended. With 2 recorded health violations, staying informed about utility communications and boil-water notices is especially important. For long-term peace of mind, request your utility's latest Consumer Confidence Report and consider independent water testing if you have specific health concerns.

Regional Context

Montgomery County has poorer water quality than the average county in Missouri. Its water score is 6.8 points lower than the state average, suggesting more challenges with contamination control or infrastructure than neighboring counties.

Past 5 years

Water Quality Monitoring

Monitoring Sites

4

Active in the past 5 years

Measurements Recorded

14K

14,205 total readings

Most Measured

  • Organics, Pesticide
  • Physical
  • Nutrient

Categories measured most frequently

Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

82.1Kcfs

May 14, 6:30 PM UTC

vs Long-Term Average

92%

Near typical

Primary Streamgage

Missouri River at Hermann, MO

USGS site
06934500
Drainage area
522,500 sq mi
Long-term mean
89.3K cfs

One representative streamgage (the one with the largest drainage area in the county). Many counties have multiple gauges — this view summarizes the primary one. The long-term mean is the full-record annual average; "% of typical" compares the latest reading against that average.

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Frequently Asked Questions

What is the water quality in Montgomery County, Missouri?
Montgomery County, Missouri has a drinking-water quality grade of D with a score of 42.0/100, based on EPA SDWIS compliance data. The county has 2 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and live streamflow are reported separately on this page.
Are there any water violations in Montgomery County?
Montgomery County has 2 health-based drinking water violations recorded by the EPA over the past 5 years. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.
How much water-quality monitoring happens in Montgomery County?
EPA's Water Quality Portal records 14,205 measurements from 4 monitoring sites in Montgomery County over the past five years. The most frequently measured characteristic groups are Organics, Pesticide, Physical, Nutrient. Each measurement is a single sample analyzed for one characteristic (E. coli, pH, dissolved oxygen, etc.). High monitoring density means more scientific evidence behind any reported signal — it does not by itself indicate water quality.
What's happening with rivers in Montgomery County right now?
Montgomery County's primary USGS streamgage on the Missouri River is currently reading 82,100 cubic feet per second — 92% of the long-term mean of 89,329.1 cfs. Flow is within typical range for this gauge. For genuine real-time data, visit waterdata.usgs.gov.
How does Montgomery County water compare to the Missouri average?
Montgomery County's SDWIS water quality score of 42.0/100 is lower than the Missouri state average of 48.8. The average water quality grade across Missouri is D, based on data from 115 counties with available SDWIS data.
Is tap water safe to drink in Montgomery County?
Based on EPA SDWIS data, Montgomery County has a water quality grade of D (42.0/100). This indicates below-average compliance with significant violations. Residents may want to consider home water filtration or independent testing. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).
Does Montgomery County have clean drinking water?
Montgomery County has 2 health-based drinking water violations according to EPA records. With a water quality score of 42.0/100 and grade D, the county's drinking water has had some compliance issues but continues to be monitored. Note: drinking-water compliance speaks to the public water system, not necessarily to the watershed itself — check the Watershed Health zone for ATTAINS §303(d) data.
How does Montgomery County rank for water quality in Missouri?
Montgomery County ranks #63 out of 115 counties in Missouri by SDWIS water quality score (1 = best). With a score of 42.0/100, it falls in the middle third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.

Counties with Similar Water Quality

Saline County

Missouri

D

42.4

Water score

Adair County

Missouri

D

42.8

Water score

St. Clair County

Missouri

F

41.0

Water score

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Water-quality monitoring counts from the EPA Water Quality Portal (WQP) — federated USGS, EPA, and state agency sampling records over a rolling 5-year window.

Live streamflow from the USGS National Water Information System (NWIS) — continuous discharge measurements from the largest-drainage gauge in each county, compared against the full-record long-term annual mean.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

By Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

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