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Federal water data

County water report

Greenville County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Greenville County, South Carolina.

Water grade

A

Water score

71.8

State rank

#18

of 46

Health violations

1

EPA SDWIS, 5-year lookback

Watershed impaired

0.0%

5 water bodies assessed

Monitoring sites

46

7,192 recent measurements

Live streamflow

23%

SALUDA RIVER NEAR WILLIAMSTON, SC

Water at a glance

Key Water Indicators for Greenville County

EPA SDWIS

Safety Grade

A

Score: 71.8 / 100

EPA SDWIS

Active Violations

1

5-year health-based lookback

EPA ATTAINS

Watershed Health

0% impaired

5 bodies assessed

USGS NWIS

Streamflow Snapshot

23% of mean

SALUDA RIVER NEAR WILLIAMSTON, SC

EPA WQP

Monitoring Sites

46

7,192 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.

71.8/100

Health violations

1

Health-based violations

Violations per 100K served

0.2

Population-normalized SDWIS rate

Editorial analysis

Understanding Greenville County’s Water

Drinking Water Quality Overview

EPA SDWIS

Greenville County earns an A grade for drinking water quality, scoring 71.8 out of 100. Over the past five years, EPA SDWIS records 1 health-based violation — a single incident worth monitoring.

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 5 water bodies) across Greenville 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 2026-05-14T14:45:00.000-04:00) puts SALUDA RIVER at 169.0 cfs — well below its long-term average at 23% 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. Greenville County has moderate coverage with 46 active monitoring sites with 7,192 recent measurements on record. Predominant monitoring categories include physical and nutrient. 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 Greenville County

Water Verdict

Greenville County receives a good water quality assessment with a grade of A and a score of 71.8 out of 100. While the water supply is generally safe, occasional monitoring gaps or minor contaminant detections may occur.

Violation Context

Greenville County has recorded 1 health-based violation, meaning the water system experienced at least one exceedance of federal contaminant limits or treatment requirements. At 0.2 violations per 100,000 people served, this rate is relatively low compared to many U.S. counties.

Consumer Guidance

Tap water in Greenville County earns a Grade A overall with a small number of isolated health violations in the recent record. Greenville County's drinking-water compliance score is 71.8 out of 100. The violation rate for Greenville County is 0.2 per 100,000 people served. These violations were likely resolved quickly; Grade A reflects a strong multi-year compliance trend. Reviewing the most recent Consumer Confidence Report will show exactly which systems were affected and what corrective action was taken. With 46 active water-quality monitoring sites in Greenville County, data coverage is strong. A pipeline streamflow snapshot from the SALUDA RIVER gauge is also available on this page.

Regional Context

Greenville County has better water quality than the average county in South Carolina. Its water score is 6.9 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 Greenville County's water environment

Official EPA Resources for Greenville County

EPA How's My Waterway

Interactive watershed health data for Greenville County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Greenville County

Consumer Confidence Reports (SC)

Annual water quality reports from utilities in South Carolina

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

0.0%

0 of 5 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

46

Active in the past 5 years

Measurements Recorded

7.2K

7,192 total readings

Most Measured

  • Physical
  • Nutrient
  • Inorganics, Minor, Metals

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

169cfs

May 14, 6:45 PM UTC

vs Long-Term Average

23%

Well below typical

Primary Streamgage

SALUDA RIVER NEAR WILLIAMSTON, SC

USGS site
02163001
Drainage area
414 sq mi
Long-term mean
726 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 Greenville 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 Greenville County, South Carolina?
Greenville County, South Carolina has a drinking-water quality grade of A with a score of 71.8/100, based on EPA SDWIS compliance data. The county has 1 health-based drinking water violation over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in Greenville County?
Greenville County has 1 health-based drinking water violation 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 Greenville County?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 0.0% of Greenville County's 5 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 Greenville County?
EPA's Water Quality Portal records 7,192 measurements from 46 monitoring sites in Greenville County over the past five years. The most frequently measured characteristic groups are Physical, Nutrient, Inorganics, Minor, Metals. 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 Greenville County right now?
Greenville County's primary USGS streamgage on the SALUDA RIVER has a pipeline snapshot of 169 cubic feet per second — 23% of the long-term mean of 725.59 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 Greenville County water compare to the South Carolina average?
Greenville County's SDWIS water quality score of 71.8/100 is higher than the South Carolina state average of 64.9. The average water quality grade across South Carolina is C, based on data from 46 counties with available SDWIS data.
Is tap water safe to drink in Greenville County?
Based on EPA SDWIS data, Greenville County has a water quality grade of A (71.8/100). 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 Greenville County have clean drinking water?
Greenville County has 1 health-based drinking water violation according to EPA records. With a water quality score of 71.8/100 and grade A, 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 Greenville County rank for water quality in South Carolina?
Greenville County ranks #18 out of 46 counties in South Carolina by SDWIS water quality score (1 = best). With a score of 71.8/100, 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

Spartanburg County

South Carolina

A

71.5

Water score

Anderson County

South Carolina

A

71.1

Water score

Horry County

South Carolina

B

68.4

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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