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County water report

San Juan County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for San Juan County, Colorado.

Water grade

A

Water score

86.0

State rank

#9

of 64

Health violations

0

EPA SDWIS, 5-year lookback

Watershed impaired

27.2%

320 water bodies assessed

Monitoring sites

248

35,832 recent measurements

Live streamflow

157%

ANIMAS RIVER BELOW SILVERTON, CO

Water at a glance

Key Water Indicators for San Juan County

EPA SDWIS

Safety Grade

A

Score: 86.0 / 100

EPA SDWIS

Active Violations

0

5-year health-based lookback

EPA ATTAINS

Watershed Health

27% impaired

320 bodies assessed

USGS NWIS

Streamflow Snapshot

157% of mean

ANIMAS RIVER BELOW SILVERTON, CO

EPA WQP

Monitoring Sites

248

35,832 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

Editorial analysis

Understanding San Juan County’s Water

Drinking Water Quality Overview

EPA SDWIS

San Juan County 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 heavily urbanized county.

Watershed Conditions

EPA ATTAINS

Under the Clean Water Act §303(d), EPA ATTAINS tracks whether waterways meet quality standards for drinking, recreation, and aquatic life (reporting cycle: 2022). A notable 27.2% of assessed waterways carry an impairment designation (87 of 320 water bodies) across San Juan County's watersheds. The leading impairment causes are arsenic and cadmium. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T13:00:00.000-06:00) puts ANIMAS RIVER BELOW SILVERTON, CO at 410.0 cfs — running significantly above its long-term average at 157% of mean flow. 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. San Juan County has extensive coverage with 248 active monitoring sites with 35,832 recent measurements on record. Predominant monitoring categories include inorganics, minor, metals and inorganics, major, metals. 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 San Juan County

Water Verdict

San Juan County, Colorado 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. Separately, EPA ATTAINS assessments cover 320 water bodies in the county's watershed, with 27.2% listed as impaired under the Clean Water Act — a source-water measure that is tracked independently of tap-water compliance. At the most recent USGS reading, local streamflow was running above its historical mean at 156.6%.

Violation Context

EPA SDWIS records for San Juan County, Colorado 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. This compliance record sits alongside an unusually deep monitoring archive: 35,832 water-quality results have been logged across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

The EPA compliance record for San Juan County shows no recent health-based violations. No health-based violations have been recorded, placing San Juan County in the top tier for drinking-water safety. San Juan County'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. With 248 active water-quality monitoring sites in San Juan County, data coverage is strong. A pipeline streamflow snapshot from the ANIMAS RIVER BELOW SILVERTON, CO gauge is also available on this page.

Regional Context

San Juan County has better water quality than the average county in Colorado. Its water score is 47.3 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.

Contaminants & Resources

Key issues flagged in San Juan County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Arsenic

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 2

    Cadmium

    Impairment cause per EPA Clean Water Act §303(d) assessment

  • 3

    Zinc

    Impairment cause per EPA Clean Water Act §303(d) assessment

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for San Juan County

EPA How's My Waterway

Interactive watershed health data for San Juan County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for San Juan County

Consumer Confidence Reports (CO)

Annual water quality reports from utilities in Colorado

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

27.2%

87 of 320 assessed

Some impairment

Top Impairment Causes

  • 1

    ARSENIC

  • 2

    CADMIUM

  • 3

    ZINC

Source: EPA ATTAINS · Reporting cycle 2022

Impairment is determined under the Clean Water Act §303(d): a water body is impaired when it fails to meet state-defined quality standards for designated uses (drinking, recreation, aquatic life). Assessment coverage varies by state; counties without assessed water bodies are not shown.

Past 5 years

Water Quality Monitoring

Monitoring Sites

248

Active in the past 5 years

Measurements Recorded

36K

35,832 total readings

Most Measured

  • Inorganics, Minor, Metals
  • Inorganics, Major, Metals
  • Physical

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

410cfs

May 14, 7:00 PM UTC

vs Long-Term Average

157%

Well above typical

Primary Streamgage

ANIMAS RIVER BELOW SILVERTON, CO

USGS site
09359020
Drainage area
146 sq mi
Long-term mean
262 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.

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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 San Juan County: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.

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San Juan County has good water quality

Learn about water restrictions and conservation in your area.

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Frequently Asked Questions

What is the water quality in San Juan County, Colorado?
San Juan County, Colorado 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 San Juan County?
San Juan County 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 healthy are the watersheds in San Juan County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 27.2% of San Juan County's 320 assessed water bodies are classified as impaired (87 impaired). The top reported causes are ARSENIC, CADMIUM, ZINC. Impairment means the water body fails to meet state quality standards for at least one designated use — drinking water source, recreation, aquatic life, or fish consumption. Note: watershed impairment doesn't always translate to tap-water issues; treatment plants can remove most regulated contaminants.
How much water-quality monitoring happens in San Juan County?
EPA's Water Quality Portal records 35,832 measurements from 248 monitoring sites in San Juan County over the past five years. The most frequently measured characteristic groups are Inorganics, Minor, Metals, Inorganics, Major, Metals, Physical. 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 San Juan County right now?
San Juan County's primary USGS streamgage on the ANIMAS RIVER BELOW SILVERTON, CO has a pipeline snapshot of 410 cubic feet per second — 157% of the long-term mean of 261.88 cfs. This is well above typical — often a signal of recent precipitation or storm runoff. For the latest gauge feed, visit waterdata.usgs.gov.
How does San Juan County water compare to the Colorado average?
San Juan County's SDWIS water quality score of 86.0/100 is higher than the Colorado state average of 38.7. The average water quality grade across Colorado is F, based on data from 64 counties with available SDWIS data.
Is tap water safe to drink in San Juan County?
Based on EPA SDWIS data, San Juan County 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 San Juan County have clean drinking water?
San Juan County 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 San Juan County rank for water quality in Colorado?
San Juan County ranks #9 out of 64 counties in Colorado 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

Cheyenne County

Colorado

A

86.0

Water score

Crowley County

Colorado

A

86.0

Water score

Custer County

Colorado

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.

Watershed health and impaired-waterway data from the EPA ATTAINS Clean Water Act §303(d) assessments, state-reported and EPA-finalized.

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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