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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

 

May 2020 (posted 06/05/2020)

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 19.86 413956070164301
Barnstable 247 21.11 414154070165001
Bourne 198 31.30* --
Brewster 21 7.40 414518070020301
Chatham 138R n/a 414100070011101
Mashpee 29 6.32 413525070291904
Sandwich 252 n/a 414418070241601
Sandwich 253 46.131 414124070265901
Truro 89 11.13* 420206070045901
Wellfleet 17 9.74* 415353069585401

*provisional

 

April 2020 (Revised 06/05/2020)

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 19.95 413956070164301
Barnstable 247R 21.43 414154070165001
Bourne 198 31.47* --
Brewster 21 7.62 414518070020301
Chatham 138R n/a 414100070011101
Mashpee 29 6.49 413525070291904
Sandwich 252 n/a 414418070241601
Sandwich 253 46.28* 414124070265901
Truro 89 10.89* 420206070045901
Wellfleet 17 9.97 415353069585401

  

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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112K pdf
Feb 05, 2020
USGS_WELL_REPORTS_January_2020
USGS OBSERVATION WELL DATA January 2020 To be used in conjunction with Cape Cod Commission Technical Bulletin 92-001, the USGS procedure for …
159K pdf
Jun 05, 2020
USGS_WELL_REPORTS_April_2020
To be used in conjunction with Cape Cod Commission Technical Bulletin 92-001, the USGS procedure for estimating high groundwater levels on Cape Cod, Massachusetts
76K doc
Mar 08, 2019
USGS OBSERVATION WELL DATA February 2019
To be used in conjunction with Cape Cod Commission Technical Bulletin 92-001, the USGS procedure for estimating high groundwater levels on Cape Cod, Massachusetts
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