waterbycounty
EPA SDWIS

South Central Connecticut Planning Region Water Quality

South Central Connecticut Planning Region, Connecticut

Water Grade

N/A

Water Score

N/A

Violations

N/A

State Rank

N/A

EPA SDWIS Compliance

Drinking Water Quality

Water Advisory: South Central Connecticut Planning Region

Water Verdict

South Central Connecticut Planning Region does not have sufficient EPA SDWIS water quality data to determine an overall assessment. Residents should contact their local water utility for the most recent Consumer Confidence Report.

Violation Context

Health-based violation data is not available for South Central Connecticut Planning Region. EPA health violations occur when water systems exceed allowable contaminant levels or fail to meet treatment requirements. Residents should request the latest Consumer Confidence Report from their water provider.

Consumer Guidance

Residents of South Central Connecticut Planning Region should obtain the annual Consumer Confidence Report from their water utility, which lists detected contaminants and any violations. Even without available data, using a NSF-certified water filter can provide additional peace of mind for drinking water.

Regional Context

State-level water quality comparison data is not available for South Central Connecticut Planning Region. When data is available, this section will show how the county's water quality compares to other counties in Connecticut.

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

66.7%

2 of 3 assessed

High concern

Top Impairment Causes

  • 1

    ESCHERICHIA COLI (E. COLI)

  • 2

    FLOW REGIME MODIFICATION

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.

Live USGS Streamgage

River & Stream Conditions

Current Discharge

113cfs

May 14, 7:00 PM UTC

vs Long-Term Average

51%

Well below typical

Primary Streamgage

QUINNIPIAC RIVER AT WALLINGFORD, CT

USGS site
01196500
Drainage area
115 sq mi
Long-term mean
223 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; "% of typical" compares the latest reading against that average.

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Frequently Asked Questions

What is the water quality in South Central Connecticut Planning Region, Connecticut?
South Central Connecticut Planning Region, Connecticut has a drinking-water quality grade of N/A with a score of N/A/100, based on EPA SDWIS compliance data. Compliance data is currently unavailable. Watershed health, monitoring records, and live streamflow are reported separately on this page.
Are there any water violations in South Central Connecticut Planning Region?
Violation data for South Central Connecticut Planning Region is not currently available. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs).
How healthy are the watersheds in South Central Connecticut Planning Region?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 66.7% of South Central Connecticut Planning Region's 3 assessed water bodies are classified as impaired (2 impaired). The top reported causes are ESCHERICHIA COLI (E. COLI), FLOW REGIME MODIFICATION. 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.
What's happening with rivers in South Central Connecticut Planning Region right now?
South Central Connecticut Planning Region's primary USGS streamgage on the QUINNIPIAC RIVER is currently reading 113 cubic feet per second — 51% of the long-term mean of 223.46 cfs. This is well below typical — often a signal of drought stress on source water. For genuine real-time data, visit waterdata.usgs.gov.
How does South Central Connecticut Planning Region water compare to the Connecticut average?
South Central Connecticut Planning Region's SDWIS water quality score of N/A/100 is not available for comparison.
Is tap water safe to drink in South Central Connecticut Planning Region?
Based on EPA SDWIS data, South Central Connecticut Planning Region has a water quality grade of N/A (N/A/100). Insufficient data is available to fully assess 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 South Central Connecticut Planning Region have clean drinking water?
South Central Connecticut Planning Region has no reported health-based drinking water violations according to EPA records. With a water quality score of N/A/100 and grade N/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 is water quality measured?
WaterByCounty layers four federal datasets per county. The A–F drinking-water grade comes from EPA SDWIS (Safe Drinking Water Act compliance, 5-year violation lookback). The Watershed Health zone surfaces EPA ATTAINS §303(d) impairment data. The Monitoring zone summarizes EPA Water Quality Portal records. The Streamflow zone reports the latest USGS NWIS reading from the county's primary streamgage. Each is reported separately so you can see where the water is actually weakest.

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, EPA-finalized.

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 Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

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