Simpaug Aquifer in Ridgefield and Redding, CT

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Access a legend for the map below
Source of Map: Water Resources Inventory of CT, Part 4, Southwestern Coastal River Basins,
by the U. S. Geological Survey and the CT Department of Environmental Protection, 1970.

THIS IS AN EARLY (1970) GENERALIZED MAP OF ESTIMATED AQUIFER BOUNDARIES ONLY
COMPARE IT TO LATER DATE USGS SURFICIAL MATERIALS MAP

EXCERPT ON SIMPAUG AQUIFER
FROM 1980 HVCEO STUDY
This aquifer was not evaluated in the 1980 HVCEO study.

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EXCERPT ON THE SIMPAUG AQUIFER FROM
A 1995 RIDGEFIELD PZC CONSULTANT’S STUDY
This aquifer is beneath a portion of the Norwalk River watershed along the eastern town boundary. About half of this aquifer falls outside Ridgefield town boundaries in Redding.

There is one USGS test hole drilled in the aquifer and one well completion report is on file at the Ridgefield Health Department. The test hole log indicates that the stratified drift is at least 50 feet thick and is composed of interbedded gravel and fine to very fine sand.

The USGS mapped the maximum saturated thickness as greater than 30 feet but less than 60 feet. The areal extent of the aquifer is about 0.4 square miles. Till separates the aquifer from the underlying bedrock.

The grain size of the aquifer material indicates potential for well development, with a limiting factor being the assumed aquifer thickness.

No analysis of water samples for organic compounds has been performed. Analysis for major ionic constituents are on file at the Health Department. LBG's search of the DEP's records did not reveal any significant threat to water quality. Similar to the Branchville aquifer, this aquifer is along Route 7; however there is residential zoning.

The 7 day, 10 year low flow was estimated between 0.7 and 0.8 million gallons per day and the average low flow was estimated to be about 1.8 million gallons per day from a total watershed area of about 8.0 square miles.