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EWG's Tap Water Database — 2021 UPDATE

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Perfluorooctane sulfonate (PFOS)

Merrimack Village District

Perfluorooctane sulfonate (PFOS) is a member of a group of perfluorinated chemicals used in many consumer products. PFOS and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.

 

340

Samples

0

Samples exceeding legal limit (MCL)

129

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND70ND
2015ND10ND
20161.06 ppt21732ND - 23.0 ppt
20170.177 ppt171ND - 3.00 ppt
20182.20 ppt44441.000 ppt - 5.40 ppt
20192.07 ppt54541.10 ppt - 3.20 ppt

ppt = parts per trillion

State and national drinking water standards and health guidelines

EWG Health Guideline 1 ppt

The EWG Health Guideline of 1 ppt for PFOS was defined by EWG based on studies by Phillipe Grandjean of Harvard University and many other independent researchers who found reduced effectiveness of vaccines and adverse impacts on mammary gland development from exposure to PFOA and PFOS, the two PFAS most widely detected in drinking water. This health guideline applies to the entire class of PFAS detected in water.

ppt = parts per trillion

All test results

Date Lab ID Result
2014-04-1435134213003AMND
2014-04-1435134213001AMND
2014-04-2235135015001AMND
2014-07-1435146449001AMND
2014-10-0735158589005AMND
2014-10-0735158589001AMND
2014-10-0735158589003AMND
2015-06-1535193367001AMND
2016-03-09K1602447-001ND
2016-03-09K1602447-004ND
2016-03-09K1602447-0026.00 ppt
2016-03-09K1602447-003ND
2016-03-31K1603194-001ND
2016-03-31K1603194-005ND
2016-03-31K1603194-002ND
2016-03-31K1603194-003ND
2016-03-31K1603194-0045.60 ppt
2016-03-31K1603194-006ND
2016-04-07K1603528-005ND
2016-04-07K1603528-0036.80 ppt
2016-04-07K1603528-0015.50 ppt
2016-04-07K1603528-004ND
2016-04-07K1603528-002ND
2016-04-14K1603866-006ND
2016-04-14K1603866-0045.50 ppt
2016-04-14K1603866-00115.0 ppt
2016-04-14K1603866-0038.80 ppt
2016-04-14K1603866-0026.10 ppt
2016-04-14K1603866-0057.00 ppt
2016-04-21K1604106-0037.00 ppt
2016-04-21K1604106-0069.10 ppt
2016-04-21K1604106-0045.40 ppt
2016-04-21K1604106-0055.40 ppt
2016-04-21K1604106-0015.50 ppt
2016-04-21K1604106-002ND
2016-04-28K1604467-001ND
2016-04-28K1604467-002ND
2016-04-28K1604467-004ND
2016-04-28K1604467-0035.90 ppt
2016-04-28K1604467-006ND
2016-04-28K1604467-005ND
2016-05-05K1604775-0044.70 ppt
2016-05-05K1604775-0054.70 ppt
2016-05-05K1604775-0014.90 ppt
2016-05-05K1604775-006ND
2016-05-05K1604775-0026.70 ppt
2016-05-05K1604775-00311.0 ppt
2016-05-12K1604985-0035.50 ppt
2016-05-12K1604985-001ND
2016-05-12K1604985-002ND
2016-05-12K1604985-004ND
2016-05-12K1604985-005ND
2016-05-12K1604985-006ND
2016-05-191605251-06ND
2016-05-191605251-02ND
2016-05-191605251-03BND
2016-05-191605251-06BND
2016-05-191605251-05ND
2016-05-191605251-01ND
2016-05-191605251-04BND
2016-05-191605251-05BND
2016-05-191605251-02BND
2016-05-191605251-01BND
2016-05-191605251-03ND
2016-05-191605251-04ND
2016-05-261605390-01ND
2016-05-261605389-01BND
2016-05-261605391-01BND
2016-05-261605391-01ND
2016-05-261605394-01ND
2016-05-261605392-01BND
2016-05-261605393-01ND
2016-05-261605394-01BND
2016-05-261605392-01ND
2016-05-261605390-01BND
2016-05-261605389-01ND
2016-05-261605393-01BND
2016-06-021606078-01ND
2016-06-021606075-01BND
2016-06-021606076-01BND
2016-06-021606080-01ND
2016-06-021606076-01ND
2016-06-021606080-01BND
2016-06-021606079-01BND
2016-06-021606077-01ND
2016-06-021606079-01ND
2016-06-021606077-01BND
2016-06-021606078-01BND
2016-06-021606075-01ND
2016-06-091606179-01BND
2016-06-091606180-01BND
2016-06-091606177-01ND
2016-06-091606178-01ND
2016-06-091606177-01BND
2016-06-091606178-01BND
2016-06-091606180-01ND
2016-06-091606179-01ND
2016-06-161606252-02BND
2016-06-161606252-02ND
2016-06-161606252-01BND
2016-06-161606252-03BND
2016-06-161606252-04BND
2016-06-161606252-03ND
2016-06-161606252-04ND
2016-06-161606252-01ND
2016-06-231606351-01BND
2016-06-231606352-01BND
2016-06-231606349-01ND
2016-06-231606351-01ND
2016-06-231606350-01BND
2016-06-231606350-01ND
2016-06-231606352-01ND
2016-06-231606349-01BND
2016-06-301607019-01BND
2016-06-30K1607569-0014.80 ppt
2016-06-301607019-01ND
2016-06-301607022-01BND
2016-06-30K1607569-004ND
2016-06-301607022-01ND
2016-06-301607020-01BND
2016-06-301607021-01ND
2016-06-30K1607569-003ND
2016-06-301607020-01ND
2016-06-301607021-01BND
2016-06-30K1607569-002ND
2016-07-071607086-01ND
2016-07-071607088-01ND
2016-07-071607089-01ND
2016-07-07K1607624-001ND
2016-07-07K1607624-003ND
2016-07-07K1607624-005ND
2016-07-071607092-01BND
2016-07-071607087-01ND
2016-07-071607090-01ND
2016-07-071607089-01BND
2016-07-071607091-01BND
2016-07-071607091-01ND
2016-07-071607087-01BND
2016-07-071607088-01BND
2016-07-071607090-01BND
2016-07-07K1607618-0047.50 ppt
2016-07-07K1607621-001ND
2016-07-071607092-01ND
2016-07-07K1607624-006ND
2016-07-07K1607624-007ND
2016-07-07K1607618-002ND
2016-07-071607086-01BND
2016-07-07K1607621-003ND
2016-07-07K1607621-004ND
2016-07-07K1607624-002ND
2016-07-07K1607624-004ND
2016-07-07K1607618-001ND
2016-07-07K1607618-0035.00 ppt
2016-07-141607214-01ND
2016-07-141607214-01BND
2016-07-141607212-01BND
2016-07-141607215-01ND
2016-07-141607215-01BND
2016-07-141607212-01ND
2016-07-141607213-01BND
2016-07-141607213-01ND
2016-07-211607277-01BND
2016-07-211607278-01BND
2016-07-211607276-01ND
2016-07-211607278-01ND
2016-07-211607276-01BND
2016-07-211607279-01BND
2016-07-211607277-01ND
2016-07-211607279-01ND
2016-07-281607343-01BND
2016-07-281607345-01BND
2016-07-281607346-01BND
2016-07-281607346-01ND
2016-07-281607343-01ND
2016-07-281607344-01ND
2016-07-281607344-01BND
2016-07-281607345-01ND
2016-08-041608075-03BND
2016-08-041608075-01BND
2016-08-041608075-02BND
2016-08-041608075-04BND
2016-08-18K1609928-003ND
2016-08-18K1609928-001ND
2016-08-18K1609928-002ND
2016-08-18K1609928-004ND
2016-09-01K1610468-003ND
2016-09-01K1610468-002ND
2016-09-01K1610468-001ND
2016-09-07K1610695-001ND
2016-09-15K1611036-0024.60 ppt
2016-09-15K1611036-00323.0 ppt
2016-09-15K1611036-00418.0 ppt
2016-09-15K1611036-001ND
2016-09-29K1611858-003ND
2016-09-29K1611858-0024.80 ppt
2016-09-29K1611858-004ND
2016-09-29K1611858-001ND
2016-10-13K1612679-0024.80 ppt
2016-10-13K1612679-001ND
2016-10-13K1612679-003ND
2016-10-13K1612679-004ND
2016-10-27K1613253-003ND
2016-10-27K1613253-004ND
2016-10-27K1613253-0015.00 ppt
2016-10-27K1613253-002ND
2016-11-10K1613978-004ND
2016-11-10K1613978-0016.20 ppt
2016-11-10K1613978-002ND
2016-11-10K1613978-003ND
2016-11-16K1614222-001ND
2016-11-16K1614222-004ND
2016-11-16K1614222-0024.60 ppt
2016-11-16K1614222-003ND
2016-12-01K1614633-004ND
2016-12-01K1614633-002ND
2016-12-01K1614633-003ND
2016-12-01K1614633-001ND
2016-12-15K1615281-002ND
2016-12-15K1615281-001ND
2016-12-15K1615281-004ND
2016-12-15K1615281-003ND
2016-12-28K1615500-001ND
2016-12-28K1615500-003ND
2016-12-28K1615500-004ND
2016-12-28K1615500-002ND
2017-01-12K1700420-002ND
2017-01-12K1700420-001ND
2017-01-12K1700420-003ND
2017-01-12K1700420-004ND
2017-01-26K1700898-001ND
2017-01-26K1700898-002ND
2017-01-26K1700898-003ND
2017-01-26K1700898-004ND
2017-02-09K1701387-001ND
2017-02-09K1701387-002ND
2017-02-09K1701387-003ND
2017-02-09K1701387-004ND
2017-03-098888465ND
2017-03-0988884643.00 ppt
2017-05-10AB67111ND
2017-05-10AB67121ND
2017-05-10AB67112ND
2018-02-1594635951.000 ppt
2018-02-1594635973.00 ppt
2018-02-1594635962.00 ppt
2018-02-1594635982.00 ppt
2018-03-2295207941.000 ppt
2018-03-2295207933.00 ppt
2018-03-2295207912.00 ppt
2018-03-2295207922.00 ppt
2018-04-1995691302.70 ppt
2018-04-1995691291.50 ppt
2018-04-1995691311.40 ppt
2018-04-1995691281.60 ppt
2018-05-2996338911.70 ppt
2018-05-2996338922.10 ppt
2018-05-2996338941.80 ppt
2018-05-2996338933.40 ppt
2018-06-2196744002.00 ppt
2018-06-2196743992.00 ppt
2018-06-2196744022.10 ppt
2018-06-2196744012.90 ppt
2018-07-1997143481.50 ppt
2018-07-1997143462.20 ppt
2018-07-1997143472.60 ppt
2018-07-1997143451.40 ppt
2018-08-2397711703.60 ppt
2018-08-2397711682.60 ppt
2018-08-2397711693.10 ppt
2018-08-2397711712.30 ppt
2018-09-1998124712.20 ppt
2018-09-1998124722.30 ppt
2018-09-1998124733.80 ppt
2018-09-1998124745.40 ppt
2018-10-2598703401.80 ppt
2018-10-2598703421.50 ppt
2018-10-2598703413.00 ppt
2018-10-2598703392.00 ppt
2018-11-2099097461.60 ppt
2018-11-2099097491.40 ppt
2018-11-2099097471.70 ppt
2018-11-2099097482.40 ppt
2018-12-2099528451.60 ppt
2018-12-2099528461.70 ppt
2018-12-2099528481.30 ppt
2018-12-2099528472.50 ppt
2019-01-1799700581.20 ppt
2019-01-1799700572.30 ppt
2019-01-1799700561.70 ppt
2019-01-1799700551.50 ppt
2019-02-2799951951.40 ppt
2019-02-2799951932.50 ppt
2019-02-2799951942.30 ppt
2019-02-2799951921.30 ppt
2019-03-2110155171.70 ppt
2019-03-2110155182.10 ppt
2019-03-2110155191.40 ppt
2019-03-2110155161.10 ppt
2019-04-1810392031.90 ppt
2019-04-1810392041.80 ppt
2019-04-1810392052.90 ppt
2019-04-1810392061.60 ppt
2019-05-2310661782.10 ppt
2019-05-2310661801.60 ppt
2019-05-2310661771.80 ppt
2019-05-2310661792.80 ppt
2019-06-1410819211.60 ppt
2019-06-1410819222.80 ppt
2019-06-1410819233.00 ppt
2019-06-1410819241.70 ppt
2019-07-2511120573.00 ppt
2019-07-2511120552.20 ppt
2019-07-2511120562.70 ppt
2019-07-2511120581.70 ppt
2019-08-2911417612.10 ppt
2019-08-2911417622.10 ppt
2019-08-2911417632.70 ppt
2019-08-2911417641.60 ppt
2019-09-2611631042.20 ppt
2019-09-2611631053.20 ppt
2019-09-2611631063.00 ppt
2019-09-2611631071.60 ppt
2019-10-2211831182.50 ppt
2019-10-2211831191.40 ppt
2019-10-2211831202.10 ppt
2019-10-2211831212.00 ppt
2019-10-2211831221.90 ppt
2019-11-2112103562.20 ppt
2019-11-2112103572.30 ppt
2019-11-2112103582.60 ppt
2019-11-2112103591.40 ppt
2019-11-2112103602.10 ppt
2019-12-0412158632.10 ppt
2019-12-0412158642.00 ppt
2019-12-0412158651.80 ppt
2019-12-1912284612.10 ppt
2019-12-1912284622.70 ppt
2019-12-1912284632.70 ppt
2019-12-1912284641.40 ppt
2019-12-1912284652.00 ppt