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Connecticut / Waters /

Fort Hill Brook

Stream in Connecticut, past Groton

Current status

No current status shown

No current status is assigned to this water outline. Check the water page for reports and any estimated downstream stretches. Why this status, and its source

This badge describes the water outline. Check the downstream stretches on the map and below for discharge statuses.

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Check Town of Groton WPCF and collection system's notices · Bookmark this water page and check it before each trip · Report a missing notice or error

About this status

No current status shown: no report we track sets a status on this water now; how statuses work. No status does not mean the water is safe. Follow posted signs and local health advice.

Sources checked: CT DEEP Sewage Right-to-Know annual report 2024 (last successful check 2026-11-03 13:21 UTC); CT DEEP reporting archive 2016-2021 (last successful check 2026-11-03 13:21 UTC). Status by DirtyWaterWatch, updated 2026-11-03 13:30 UTC. · Updated

Estimated downstream stretches on Fort Hill Brook

none with a current status

No downstream stretch has a current status here as of Nov 3, 2026, 8:30 AM EST. Check the reports below.

The last 90 days

Last 90 days, hour by hour. Red: discharge or advisory reported. Amber: caution. Hatched amber: end not confirmed. Plum: algal bloom advisory. Red or amber with a light line inside: beach advisory or caution. Dotted: monthly report (days with discharge, dates not given). Grey: no current status on the water outline. Purple hatching: source update overdue.

No discharge, advisory or caution periods are shown for this water in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-03 13:30 UTC.

Reported discharges over time

  • Discharges affecting the Fort Hill Brook in Connecticut, last 12 months00 affecting this stretch: 0 reported in Connecticut, none arriving from upstreamDecember 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once. Arriving discharges are estimated from modeled downstream reaches.
  • Days with a discharge affecting the Fort Hill Brook in Connecticut, last 12 months0Reported on the Fort Hill Brook in Connecticut: 0 · Arriving from outfalls upstream, estimated: 0December 2025 to November 2026A day counts once however many discharges were under way on it. Verified reports where available, else notices; revisions and duplicates counted once.
  • Hours with a discharge or advisory status on the Fort Hill Brook in Connecticut, last 12 months0Reported on the Fort Hill Brook in Connecticut: 0 · Arriving from outfalls upstream, estimated: 0December 2025 to November 2026Red hours by the map's rules: each discharge to its reported end plus the state's post-discharge period; overlapping hours count once.
  • 2026 season with a discharge or advisory status on the Fort Hill Brook in Connecticut0.0%May to October 2026Share of May 1 to October 31 hours with red status by the map's rules, of the hours a source covered.
  • Records behind the last-90-days strip for the Fort Hill Brook in Connecticut0Reported on the Fort Hill Brook in Connecticut: 0 · Arriving from outfalls upstream, estimated: 0last 90 daysEvery distinct record the strip lists for its red, yellow and unresolved hours, notices and unresolved reports included; counted as the strip counts them.

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system. Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater. Treatment bypass: wastewater skips one or more treatment steps. Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater. Outfall: a pipe or outlet where wastewater enters a water body.

Reported discharges per month

1 reported discharge, January 2022 to November 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other

Connecticut's Sewage Right-to-Know annual reports cover January 1, 2021 to November 3, 2026.

Source: Connecticut Sewage Right-to-Know annual reports. Records cover January 1, 2022 to November 3, 2026.

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Hours with a discharge or advisory status per month

Hours when this water had a discharge or advisory status under DirtyWaterWatch rules.

  • Discharge or advisory reported

2 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here. Connecticut's Sewage Right-to-Know annual reports cover January 1, 2021 to November 3, 2026. Connecticut's reporting archive runs from July 4, 2016 to December 2, 2021.

Sources: Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Days with a reported discharge per month

A day counts when any counted discharge was under way on it, from its start to its reported end in Eastern Time; a report with no end counts its start day.

Source: Connecticut Sewage Right-to-Know annual reports. Records cover January 1, 2022 to November 3, 2026.

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Reported discharges per year, 2016 to 2026

8 reported discharges, 2016 to 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other
  • Incomplete source coverage

Connecticut's Sewage Right-to-Know annual reports cover January 1, 2021 to November 3, 2026. Connecticut's reporting archive runs from July 4, 2016 to December 2, 2021.

Sources: Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Reported volume per year

Gallons (axis: K thousand, M million), summed from the 4 reports that gave a volume as a number (4 did not).

  • Incomplete source coverage

4 of 8 discharge reports gave no volume as a number (2 gave a range); only numbers are summed. Connecticut's 2016 to 2021 archive gives volumes as ranges ("20,001 - 50,000 gallons"); they are not summed.

Sources: Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Hours with a discharge or advisory status per year

Hours with a discharge or advisory status each year under DirtyWaterWatch rules; 2026 to date.

  • Discharge or advisory reported
  • Incomplete source coverage

2 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here.

Sources: Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Share of the May to October season with a discharge or advisory status

Share of the hours from May 1 to October 31 with a discharge or advisory status under DirtyWaterWatch rules.

  • Discharge or advisory reported
  • Season with incomplete source coverage

Seasons with incomplete source coverage: 2016. The share is of the hours a source covered. 2 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here.

Sources: Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Reported discharges by calendar month, all years

Every counted discharge report, by the calendar month it began.

Months are summed over every year a tracked source covers; the table gives the number of years behind each month.

Sources: Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Reported discharges by wastewater outlet

Wastewater outlets with the most tracked discharge records: 4 of 4, all years. Counts depend on reporting coverage and do not measure legal compliance or harm.

Connecticut's Sewage Right-to-Know annual reports cover January 1, 2021 to November 3, 2026. Connecticut's reporting archive runs from July 4, 2016 to December 2, 2021.

Sources: Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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How these charts are counted

We count each discharge once. Where a source publishes notices and confirmed reports, we use confirmed reports for an operator's month when available; otherwise we use notices. We combine revisions and exclude duplicate state reports copied by the U.S. Environmental Protection Agency (EPA). Monthly and yearly totals appear separately. Status hours follow this site's rules. Shaded gaps mean missing coverage, not zero discharges.

  • Connecticut Sewage Right-to-Know annual reports: records from January 1, 2021 to the latest update
  • Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021: records from July 4, 2016 to December 2, 2021

Reports linked to Fort Hill Brook

Treatment bypass: wastewater skips one or more treatment steps. Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.

Reports linked to Fort Hill Brook, newest first
WhenReportStatus
to Sep 6 ’22, 4:00 AMGROTON, TOWN OF · Treatment Plant, 170 Gary Ct, Groton, CT · Bypass · 1.1 million gallons report · notice · mapended
to 6:30 AMGroton, Town of · Treatment Plant, 170 Gary Court · Bypass · volume in each report mapended
to 11:23 AMGroton, Town of · Treatment Plant, 170 Gary Court · Bypass · 125,000 gallons report · notice · mapended
to May 8 ’19, 9:20 AMGroton, Town of · Sewer Main, TEST TEST TEST · SSO · “TEST TEST TEST” report · notice · mapended
to May 7 ’19, 1:10 PMGroton, Town of · Treatment Plant, TEST TEST TEST · Bypass · “TEST TEST TEST” report · notice · mapended
to 7:38 PMGroton, Town of · Treatment Plant, 170 Gary Court · Bypass · 62,500 gallons report · notice · mapended
to Jul 30 ’18, 9:00 AMGroton, Town of · Treatment Plant, 170 Gary Court · Bypass · 125,000 gallons report · notice · mapended

Sources: CT DEEP Sewage Right-to-Know annual report 2024, retrieved 2026-11-03 13:20 UTC; CT DEEP reporting archive 2016-2021, retrieved 2026-11-03 13:21 UTC. A report's record id and times show when you hover or focus its "report" link.

Download these reports as CSV

All reports in Connecticut by year: 2022 (1 here) · 2019 (6 here) · 2018 (1 here)

Wastewater outlets on this water

Outfall: a pipe or outlet where wastewater enters a water body.

No wastewater outlet in our records is linked to this water.

Sewer operators listed for this water: Town of Groton WPCF and collection system.

Boat launches

No public boat launch is listed in our records for this water.

Nearby waters

Sources covering this water

8 records linked to this water. Updated .