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Overview

As a service to Cape officials, engineers and other interested parties, the Cape Cod Commission publishes monthly data about water levels at groundwater observation wells on Cape Cod. The data provide current information for the effective siting of septic and stormwater management systems and give historical context for year to year fluctuations in the regional water table. Past records on selected wells extend back to the 1950s.

The water level measurements shown below are taken monthly from United States Geological Survey (USGS) observation wells. They are compiled during the last week of each month and are published as soon as possible thereafter.

Listed below are nine out of the 32 wells measured across Cape Cod by the Commission's Water Resources staff. These nine are employed as index wells to be used with Technical Bulletin 92-001: Estimation of High Groundwater Levels for Construction and Land Use Planning to predict high groundwater levels. The USGS maintains records of this data as part of its National Water Information System (NWIS) network.  Links to the NWIS records for each well are located in the last column of the table.

 

Monthly Index Well Data

 

August 2020 (Revised 08/26/2020)

The following table is also available as a downloadable file.

Location Well No. Water Level
(feet below land surface)
USGS Site Number
(links to USGS national water-level database)
Barnstable 230 22.08 413956070164301
Barnstable 247R 22.95 414154070165001
Bourne 198 33.32* --
Brewster 21 8.37 414518070020301
Chatham 138R n/a 414100070011101
Mashpee 29 9.03 413525070291904
Sandwich 252 n/a 414418070241601
Sandwich 253 47.56* 414124070265901
Truro 89 11.83* 420206070045901
Wellfleet 17 10.91 415353069585401

 

 

July 2020 (posted 08/07/2020)

The following table is also available as a downloadable file.

Location Well No. Water Level
(feet below land surface)
USGS Site Number
(links to USGS national water-level database)
Barnstable 230 21.42 413956070164301
Barnstable 247 22.25 414154070165001
Bourne 198 32.68* --
Brewster 21 7.93 414518070020301
Chatham 138R n/a 414100070011101
Mashpee 29 7.48 413525070291904
Sandwich 252 n/a 414418070241601
Sandwich 253 46.94 414124070265901
Truro 89 11.60* 420206070045901
Wellfleet 17 10.50* 415353069585401

*provisional

 

NOTE: USGS national water-level database provides historic data, hydrographs, and site maps.

LINK: Past Well Data

 

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Project Resources

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122K pdf
Aug 06, 2019
USGS_WELL_REPORTS_July_2019
USGS OBSERVATION WELL DATA July 2019 To be used in conjunction with Cape Cod Commission Technical Bulletin 92-001, the USGS procedure for estimating …
122K pdf
May 06, 2019
USGS_WELL_REPORTS_Apr_2019
USGS OBSERVATION WELL DATA April 2019 To be used in conjunction with Cape Cod Commission Technical Bulletin 92-001, the USGS procedure for estimating …
112K pdf
Nov 05, 2019
USGS_WELL_REPORTS_October_2019
USGS OBSERVATION WELL DATA October 2019 To be used in conjunction with Cape Cod Commission Technical Bulletin 92-001, the USGS procedure for …
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