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Federal water data

County water report

St. Louis city Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for St. Louis city, Missouri.

Water grade

A

Water score

86.0

State rank

#30

of 115

Health violations

0

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

10

5,734 recent measurements

Live streamflow

125%

Mississippi River at St. Louis, MO

Water at a glance

Key Water Indicators for St. Louis city

EPA SDWIS

Safety Grade

A

Score: 86.0 / 100

EPA SDWIS

Active Violations

0

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

125% of mean

Mississippi River at St. Louis, MO

EPA WQP

Monitoring Sites

10

5,734 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

A

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

86.0/100

Health violations

0

Health-based violations

Violations per 100K served

0.0

Population-normalized SDWIS rate

Data center water stress

St. Louis city has 3 facilities in the DCWSI dataset.

ByCounty's DCWSI ranks this county #48 nationally by combining its water score with mapped data center density.

DCWSIThe Data Center Water Stress Index: 60% the county's water-system stress plus 40% how concentrated data centers already are, scored 0-100. Higher means data-center density and water pressure overlap more here.

76.0

0-100 index

Facility count

3

61.1 density percentile

Discharge estimate

Not reported

EPA CWA fields where available

Water vs median

+36.0

Compared with US county median

Named operators

Washington University in St. Louis

Mapped facilities

  • Genome Data Center

    Saint Louis · Washington University in St. Louis

    OSM

  • Netrality Data Centers

    Saint Louis

    OSM

  • TierPoint

    Saint Louis

    OSM
See the St. Louis city data-center reportReview methodology

Data Center Water Budget Calculator

Estimate daily water use for a hypothetical facility in St. Louis city.

1 MW1,000 MW
40%100%
799K gallons/dayHigh Impact

Your facility would use 41.4% of this county's industrial water baseline. Verify water rights and long-term drought projections before committing.

41.4% of county industrial baseline1.13 Mgal/day remaining headroom

Based on USGS 2020 water-use data and EPA-standard cooling intensity constants. Not a substitute for site-specific water rights analysis.

Editorial analysis

Understanding St. Louis city’s Water

Drinking Water Quality Overview

EPA SDWIS

St. Louis city earns an A grade for drinking water quality, scoring 86.0 out of 100. EPA's Safe Drinking Water Information System (SDWIS) records zero health-based violations over the past five years — a strong compliance signal for a small county.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T14:00:00.000-05:00) puts Mississippi River at 250.0k cfs — flowing above its historical average at 125% of mean. Streamflow is a leading indicator of drought stress, sediment load, and dilution capacity: low flows concentrate pollutants and warm water temperatures, stressing aquatic life and, in surface-water-dependent systems, the source water quality for treatment plants.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. St. Louis city has moderate coverage with 10 active monitoring sites with 5,734 recent measurements on record. Predominant monitoring categories include physical and sediment. More monitoring sites generally indicate greater scientific attention to local water conditions — and provide the baseline data that regulators use to set future impairment listings.

Editorial advisory

What the data suggests for St. Louis city

Water Verdict

St. Louis city, Missouri receives an excellent water quality assessment with a grade of A and a score of 86.0 out of 100. The water supply meets or exceeds federal safety standards, and residents can generally drink tap water with confidence. The county's primary USGS gauge drains roughly 697,000 square miles of upstream watershed, giving local source waters a regional footprint. At the most recent USGS reading, local streamflow was running above its historical mean at 124.9%.

Violation Context

EPA SDWIS records for St. Louis city, Missouri show zero health-based violations, indicating that the county's water systems met all federal safety standards during the reporting period. The violation rate is zero per 100,000 people served, which is the best possible outcome. For independent context, 5,734 water-quality monitoring results have been recorded across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Tap water in St. Louis city is safe to drink based on current EPA compliance records. No health-based violations have been recorded, placing St. Louis city in the top tier for drinking-water safety. St. Louis city's drinking-water compliance score is 86.0 out of 100. As a routine precaution, requesting your utility's annual Consumer Confidence Report each July gives you a full list of detected contaminants and their treatment levels. There are 10 active water-quality monitoring sites in St. Louis city. A pipeline streamflow snapshot from the Mississippi River gauge is also available on this page.

Regional Context

St. Louis city has better water quality than the average county in Missouri. Its water score is 37.2 points higher than the state average, indicating stronger water system performance relative to neighboring counties.

Advisory text summarizes county-level public records and is not a replacement for your utility's current Consumer Confidence Report or direct local notices.

Past 5 years

Water Quality Monitoring

Monitoring Sites

10

Active in the past 5 years

Measurements Recorded

5.7K

5,734 total readings

Most Measured

  • Physical
  • Sediment
  • 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

250.0Kcfs

May 14, 7:00 PM UTC

vs Long-Term Average

125%

Above typical

Primary Streamgage

Mississippi River at St. Louis, MO

USGS site
07010000
Drainage area
697,000 sq mi
Long-term mean
200.2K 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; the percent-of-typical value compares the latest reading against that average.

Free tool

Estimate Your Water Costs

Water Cost Estimate

3

3 people  ·  ~225 gal/day

Annual Total

$558

Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for St. Louis city:B — Good

Minor violations; waterways mostly healthy.

Estimates use the national average residential water rate ($0.0068/gal, EPA/AWWA 2023) and EPA WaterSense per-person consumption baseline (75 gal/person/day). Actual bills vary by utility, usage tier, and local infrastructure fees. For informational purposes only.

Try the full calculator →

St. Louis city has good water quality

Learn about water restrictions and conservation in your area.

Water Restrictions →

Frequently Asked Questions

What is the water quality in St. Louis city, Missouri?
St. Louis city, Missouri has a drinking-water quality grade of A with a score of 86.0/100, based on EPA SDWIS compliance data. The county has 0 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in St. Louis city?
St. Louis city has 0 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). Zero violations is an excellent record indicating consistent compliance with federal drinking water standards.
How much water-quality monitoring happens in St. Louis city?
EPA's Water Quality Portal records 5,734 measurements from 10 monitoring sites in St. Louis city over the past five years. The most frequently measured characteristic groups are Physical, Sediment, 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 St. Louis city right now?
St. Louis city's primary USGS streamgage on the Mississippi River has a pipeline snapshot of 250,000 cubic feet per second — 125% of the long-term mean of 200,223.87 cfs. Flow is within typical range for this gauge. For the latest gauge feed, visit waterdata.usgs.gov.
How does St. Louis city water compare to the Missouri average?
St. Louis city's SDWIS water quality score of 86.0/100 is higher 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 St. Louis city?
Based on EPA SDWIS data, St. Louis city has a water quality grade of A (86.0/100). This indicates good to excellent water quality with strong SDWIS compliance. 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 St. Louis city have clean drinking water?
St. Louis city has 0 health-based drinking water violations according to EPA records. With a water quality score of 86.0/100 and grade A, the county's drinking water meets EPA standards with no recorded health violations. 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 St. Louis city rank for water quality in Missouri?
St. Louis city ranks #30 out of 115 counties in Missouri by SDWIS water quality score (1 = best). With a score of 86.0/100, it falls in the top 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

Atchison County

Missouri

A

86.0

Water score

Barton County

Missouri

A

86.0

Water score

Bollinger County

Missouri

A

86.0

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 Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

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