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Federal water data

County water report

Lincoln County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Lincoln County, New Mexico.

Water grade

F

Water score

20.2

State rank

#13

of 32

Health violations

37

EPA SDWIS, 5-year lookback

Watershed impaired

18.0%

50 water bodies assessed

Monitoring sites

45

8,502 recent measurements

Live streamflow

31%

RIO RUIDOSO AT HOLLYWOOD, NM

Water at a glance

Key Water Indicators for Lincoln County

EPA SDWIS

Safety Grade

F

Score: 20.2 / 100

EPA SDWIS

Active Violations

37

5-year health-based lookback

EPA ATTAINS

Watershed Health

18% impaired

50 bodies assessed

USGS NWIS

Streamflow Snapshot

31% of mean

RIO RUIDOSO AT HOLLYWOOD, NM

EPA WQP

Monitoring Sites

45

8,502 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

F

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

20.2/100

Health violations

37

Health-based violations

Violations per 100K served

130.7

Population-normalized SDWIS rate

Editorial analysis

Understanding Lincoln County’s Water

Drinking Water Quality Overview

EPA SDWIS

Lincoln County's water systems carry a failing grade, scoring 20.2 out of 100. Over the past five years, EPA SDWIS records 37 health-based violations — a pattern that public water utilities are required to disclose and correct.

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 18.0% of assessed waterways carry an impairment designation (9 of 50 water bodies) across Lincoln County's watersheds. The leading impairment causes are flow regime modification and temperature. 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 2026-05-14T12:55:00.000-06:00) puts RIO RUIDOSO at 5.4 cfs — well below its long-term average at 31% of mean — low-flow conditions worth noting for water-dependent ecosystems. 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. Lincoln County has moderate coverage with 45 active monitoring sites with 8,502 recent measurements on record. Predominant monitoring categories include inorganics, minor, metals and physical. 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 Lincoln County

Water Verdict

Lincoln County, New Mexico receives a poor water quality assessment with a grade of F and a score of 20.2 out of 100. The water supply has documented quality issues. Residents are strongly encouraged to use filtered or bottled water for drinking and to stay informed about utility improvement plans. Separately, EPA ATTAINS assessments cover 50 water bodies in the county's watershed, with 18.0% 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 below its historical mean at 30.8% — worth watching in drier seasons.

Violation Context

EPA SDWIS records for Lincoln County, New Mexico show 37 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 130.7 violations per 100,000 people served, this rate is high and signals significant water quality management issues. For independent context, 8,502 water-quality monitoring results have been recorded across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Lincoln County has a Grade F compliance record with 37 health-based violations — among the highest levels in the country. Lincoln County's drinking-water compliance score is 20.2 out of 100. Residents are strongly advised to use a certified NSF 58 reverse-osmosis filter or bottled water for all drinking and cooking until violations are corrected. Contacting the New Mexico Department of Environmental Quality or Health can expedite utility compliance action. Flow Regime Modification is the leading impairment cause in Lincoln County's watershed. With 45 active water-quality monitoring sites in Lincoln County, data coverage is strong. A pipeline streamflow snapshot from the RIO RUIDOSO gauge is also available on this page.

Regional Context

Lincoln County has water quality close to the average county in New Mexico. Its water score is within 1.5 points of the state average, meaning its overall water system performance is broadly representative of New Mexico as a whole.

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 Lincoln County's water environment

Watershed Impairment Causes (EPA ATTAINS)

  • 1

    Flow Regime Modification

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

  • 2

    Elevated temperature

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

  • 3

    E. coli (bacteria)

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

Source: EPA ATTAINS · Reporting cycle 2022

Official EPA Resources for Lincoln County

EPA How's My Waterway

Interactive watershed health data for Lincoln County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Lincoln County

Consumer Confidence Reports (NM)

Annual water quality reports from utilities in New Mexico

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

18.0%

9 of 50 assessed

Some impairment

Top Impairment Causes

  • 1

    FLOW REGIME MODIFICATION

  • 2

    TEMPERATURE

  • 3

    ESCHERICHIA COLI (E. COLI)

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

45

Active in the past 5 years

Measurements Recorded

8.5K

8,502 total readings

Most Measured

  • Inorganics, Minor, Metals
  • Physical
  • Organics, Other

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

5.38cfs

May 14, 6:55 PM UTC

vs Long-Term Average

31%

Well below typical

Primary Streamgage

RIO RUIDOSO AT HOLLYWOOD, NM

USGS site
08387000
Drainage area
120 sq mi
Long-term mean
17.5 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

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Annual Total

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Monthly

$47

Water Bill

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Filter Cost

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Safety Grade for Lincoln County:C — Moderate

Some violations or watershed impairment detected.

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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Frequently Asked Questions

What is the water quality in Lincoln County, New Mexico?
Lincoln County, New Mexico has a drinking-water quality grade of F with a score of 20.2/100, based on EPA SDWIS compliance data. The county has 37 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 Lincoln County?
Lincoln County has 37 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 healthy are the watersheds in Lincoln County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 18.0% of Lincoln County's 50 assessed water bodies are classified as impaired (9 impaired). The top reported causes are FLOW REGIME MODIFICATION, TEMPERATURE, ESCHERICHIA COLI (E. COLI). 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 Lincoln County?
EPA's Water Quality Portal records 8,502 measurements from 45 monitoring sites in Lincoln County over the past five years. The most frequently measured characteristic groups are Inorganics, Minor, Metals, Physical, Organics, Other. 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 Lincoln County right now?
Lincoln County's primary USGS streamgage on the RIO RUIDOSO has a pipeline snapshot of 5.38 cubic feet per second — 31% of the long-term mean of 17.48 cfs. This is well below typical — often a signal of drought stress on source water. For the latest gauge feed, visit waterdata.usgs.gov.
How does Lincoln County water compare to the New Mexico average?
Lincoln County's SDWIS water quality score of 20.2/100 is lower than the New Mexico state average of 21.7. The average water quality grade across New Mexico is F, based on data from 32 counties with available SDWIS data.
Is tap water safe to drink in Lincoln County?
Based on EPA SDWIS data, Lincoln County has a water quality grade of F (20.2/100). 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).
Why does Lincoln County have so many water violations?
Lincoln County has 37 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.
How does Lincoln County rank for water quality in New Mexico?
Lincoln County ranks #13 out of 32 counties in New Mexico by SDWIS water quality score (1 = best). With a score of 20.2/100, 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

Harding County

New Mexico

F

20.0

Water score

Sandoval County

New Mexico

F

18.1

Water score

Grant County

New Mexico

F

17.9

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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