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County water report

Columbia County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Columbia County, Pennsylvania.

Water grade

D

Water score

48.1

State rank

#23

of 67

Health violations

10

EPA SDWIS, 5-year lookback

Watershed impaired

0.0%

33,637 water bodies assessed

Monitoring sites

122

6,203 recent measurements

Live streamflow

115%

Susquehanna River at Bloomsburg, PA

Water at a glance

Key Water Indicators for Columbia County

EPA SDWIS

Safety Grade

D

Score: 48.1 / 100

EPA SDWIS

Active Violations

10

5-year health-based lookback

EPA ATTAINS

Watershed Health

0% impaired

33,637 bodies assessed

USGS NWIS

Streamflow Snapshot

115% of mean

Susquehanna River at Bloomsburg, PA

EPA WQP

Monitoring Sites

122

6,203 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

D

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

48.1/100

Health violations

10

Health-based violations

Violations per 100K served

19.1

Population-normalized SDWIS rate

Editorial analysis

Understanding Columbia County’s Water

Drinking Water Quality Overview

EPA SDWIS

Columbia County's drinking water received a D grade, scoring 48.1 out of 100. Over the past five years, EPA SDWIS records 10 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). None of the assessed waterways are listed as impaired (0 of 33,637 water bodies) across Columbia County's watersheds. 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 2026-05-14T14:15:00.000-04:00) puts Susquehanna River at 18.4k cfs — flowing above its historical average at 115% 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. Columbia County has extensive coverage with 122 active monitoring sites with 6,203 recent measurements on record. Predominant monitoring categories include physical and inorganics, minor, 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 Columbia County

Water Verdict

Columbia County receives a below-average water quality assessment with a grade of D and a score of 48.1 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Columbia County has recorded 10 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 19.1 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Columbia County's drinking-water compliance is below average with a Grade D, indicating repeated or unresolved violations in the recent record. Columbia County's drinking-water compliance score is 48.1 out of 100. The violation rate for Columbia County is 19.1 per 100,000 people served. Residents are encouraged to use an NSF 53 or NSF 58-certified filter for drinking and cooking water until the underlying violations are resolved. Running tap water for 30 seconds before use and avoiding older lead-pipe connections can also reduce exposure risk. The current Consumer Confidence Report from your utility will specify the contaminants of concern. With 122 active water-quality monitoring sites in Columbia County, data coverage is strong. A pipeline streamflow snapshot from the Susquehanna River gauge is also available on this page.

Regional Context

Columbia County has better water quality than the average county in Pennsylvania. Its water score is 9.2 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.

Contaminants & Resources

Key issues flagged in Columbia County's water environment

Official EPA Resources for Columbia County

EPA How's My Waterway

Interactive watershed health data for Columbia County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Columbia County

Consumer Confidence Reports (PA)

Annual water quality reports from utilities in Pennsylvania

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

0.0%

0 of 33,637 assessed

Mostly healthy

Top Impairment Causes

No specific impairment causes reported for the assessed water bodies in this county.

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

122

Active in the past 5 years

Measurements Recorded

6.2K

6,203 total readings

Most Measured

  • Physical
  • Inorganics, Minor, Metals
  • Microbiological

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

18.4Kcfs

May 14, 6:15 PM UTC

vs Long-Term Average

115%

Above typical

Primary Streamgage

Susquehanna River at Bloomsburg, PA

USGS site
01538700
Drainage area
10,560 sq mi
Long-term mean
15.9K 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

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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 Columbia 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 Columbia County, Pennsylvania?
Columbia County, Pennsylvania has a drinking-water quality grade of D with a score of 48.1/100, based on EPA SDWIS compliance data. The county has 10 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 Columbia County?
Columbia County has 10 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 Columbia County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 0.0% of Columbia County's 33,637 assessed water bodies are classified as impaired (0 impaired). 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 Columbia County?
EPA's Water Quality Portal records 6,203 measurements from 122 monitoring sites in Columbia County over the past five years. The most frequently measured characteristic groups are Physical, Inorganics, Minor, Metals, Microbiological. 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 Columbia County right now?
Columbia County's primary USGS streamgage on the Susquehanna River has a pipeline snapshot of 18,400 cubic feet per second — 115% of the long-term mean of 15,940 cfs. Flow is within typical range for this gauge. For the latest gauge feed, visit waterdata.usgs.gov.
How does Columbia County water compare to the Pennsylvania average?
Columbia County's SDWIS water quality score of 48.1/100 is higher than the Pennsylvania state average of 38.9. The average water quality grade across Pennsylvania is F, based on data from 67 counties with available SDWIS data.
Is tap water safe to drink in Columbia County?
Based on EPA SDWIS data, Columbia County has a water quality grade of D (48.1/100). 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 Columbia County have so many water violations?
Columbia County has 10 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 Columbia County rank for water quality in Pennsylvania?
Columbia County ranks #23 out of 67 counties in Pennsylvania by SDWIS water quality score (1 = best). With a score of 48.1/100, 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

Luzerne County

Pennsylvania

D

48.6

Water score

York County

Pennsylvania

D

47.6

Water score

Somerset County

Pennsylvania

D

47.5

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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