Perfluoroheptanoic acid (PFHpA)
Merrimack Village District
Perfluoroheptanoic acid (PFHpA) is a member of a group of perfluorinated chemicals used in many consumer products. PFHpA 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.
314
Samples
0
Samples exceeding legal limit (MCL)
199
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | 2.88 ppt | 217 | 115 | ND - 23.0 ppt |
| 2017 | 2.39 ppt | 17 | 6 | ND - 15.0 ppt |
| 2018 | 2.74 ppt | 44 | 44 | 1.000 ppt - 5.50 ppt |
| 2019 | 3.07 ppt | 36 | 36 | 1.10 ppt - 7.30 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 PFHpA was defined by EWG as 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 protects against applies to the entire class of PFAS detected in water.
ppt = parts per trillion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2016-03-09 | K1602447-003 | 8.60 ppt |
| 2016-03-09 | K1602447-002 | 12.0 ppt |
| 2016-03-09 | K1602447-001 | ND |
| 2016-03-09 | K1602447-004 | 8.50 ppt |
| 2016-03-31 | K1603194-005 | ND |
| 2016-03-31 | K1603194-001 | ND |
| 2016-03-31 | K1603194-006 | ND |
| 2016-03-31 | K1603194-004 | 12.0 ppt |
| 2016-03-31 | K1603194-002 | ND |
| 2016-03-31 | K1603194-003 | 8.60 ppt |
| 2016-04-07 | K1603528-001 | ND |
| 2016-04-07 | K1603528-002 | ND |
| 2016-04-07 | K1603528-005 | ND |
| 2016-04-07 | K1603528-004 | 9.00 ppt |
| 2016-04-07 | K1603528-003 | 14.0 ppt |
| 2016-04-14 | K1603866-002 | 6.40 ppt |
| 2016-04-14 | K1603866-001 | ND |
| 2016-04-14 | K1603866-004 | 11.0 ppt |
| 2016-04-14 | K1603866-005 | ND |
| 2016-04-14 | K1603866-006 | ND |
| 2016-04-14 | K1603866-003 | 13.0 ppt |
| 2016-04-21 | K1604106-006 | ND |
| 2016-04-21 | K1604106-004 | 9.10 ppt |
| 2016-04-21 | K1604106-001 | ND |
| 2016-04-21 | K1604106-002 | 5.00 ppt |
| 2016-04-21 | K1604106-005 | ND |
| 2016-04-21 | K1604106-003 | 12.0 ppt |
| 2016-04-28 | K1604467-003 | 13.0 ppt |
| 2016-04-28 | K1604467-001 | ND |
| 2016-04-28 | K1604467-004 | 10.00 ppt |
| 2016-04-28 | K1604467-006 | ND |
| 2016-04-28 | K1604467-002 | 5.60 ppt |
| 2016-04-28 | K1604467-005 | ND |
| 2016-05-05 | K1604775-004 | 11.0 ppt |
| 2016-05-05 | K1604775-001 | 5.40 ppt |
| 2016-05-05 | K1604775-002 | 8.90 ppt |
| 2016-05-05 | K1604775-005 | ND |
| 2016-05-05 | K1604775-003 | 23.0 ppt |
| 2016-05-05 | K1604775-006 | ND |
| 2016-05-12 | K1604985-005 | ND |
| 2016-05-12 | K1604985-003 | 10.00 ppt |
| 2016-05-12 | K1604985-004 | 9.40 ppt |
| 2016-05-12 | K1604985-006 | ND |
| 2016-05-12 | K1604985-001 | ND |
| 2016-05-12 | K1604985-002 | 5.80 ppt |
| 2016-05-19 | 1605251-01B | 3.00 ppt |
| 2016-05-19 | 1605251-03B | ND |
| 2016-05-19 | 1605251-03 | ND |
| 2016-05-19 | 1605251-02B | 4.00 ppt |
| 2016-05-19 | 1605251-02 | 4.00 ppt |
| 2016-05-19 | 1605251-04 | 8.00 ppt |
| 2016-05-19 | 1605251-04B | 8.00 ppt |
| 2016-05-19 | 1605251-06B | 2.00 ppt |
| 2016-05-19 | 1605251-01 | 3.00 ppt |
| 2016-05-19 | 1605251-05 | ND |
| 2016-05-19 | 1605251-06 | 2.00 ppt |
| 2016-05-19 | 1605251-05B | ND |
| 2016-05-26 | 1605394-01B | 3.00 ppt |
| 2016-05-26 | 1605393-01 | 2.00 ppt |
| 2016-05-26 | 1605392-01 | 2.00 ppt |
| 2016-05-26 | 1605392-01B | 2.00 ppt |
| 2016-05-26 | 1605391-01B | 7.00 ppt |
| 2016-05-26 | 1605390-01 | 6.00 ppt |
| 2016-05-26 | 1605389-01B | 3.00 ppt |
| 2016-05-26 | 1605390-01B | 6.00 ppt |
| 2016-05-26 | 1605393-01B | 2.00 ppt |
| 2016-05-26 | 1605394-01 | 3.00 ppt |
| 2016-05-26 | 1605389-01 | 3.00 ppt |
| 2016-05-26 | 1605391-01 | 7.00 ppt |
| 2016-06-02 | 1606080-01B | ND |
| 2016-06-02 | 1606076-01 | 4.00 ppt |
| 2016-06-02 | 1606077-01 | 4.00 ppt |
| 2016-06-02 | 1606075-01B | 3.00 ppt |
| 2016-06-02 | 1606078-01 | ND |
| 2016-06-02 | 1606080-01 | ND |
| 2016-06-02 | 1606076-01B | 4.00 ppt |
| 2016-06-02 | 1606078-01B | ND |
| 2016-06-02 | 1606079-01 | ND |
| 2016-06-02 | 1606077-01B | 4.00 ppt |
| 2016-06-02 | 1606075-01 | 3.00 ppt |
| 2016-06-02 | 1606079-01B | ND |
| 2016-06-09 | 1606179-01 | ND |
| 2016-06-09 | 1606177-01B | 4.00 ppt |
| 2016-06-09 | 1606178-01 | ND |
| 2016-06-09 | 1606180-01 | ND |
| 2016-06-09 | 1606177-01 | 4.00 ppt |
| 2016-06-09 | 1606179-01B | ND |
| 2016-06-09 | 1606178-01B | ND |
| 2016-06-09 | 1606180-01B | ND |
| 2016-06-16 | 1606252-03B | 2.00 ppt |
| 2016-06-16 | 1606252-04B | ND |
| 2016-06-16 | 1606252-02B | ND |
| 2016-06-16 | 1606252-04 | ND |
| 2016-06-16 | 1606252-01 | 4.00 ppt |
| 2016-06-16 | 1606252-01B | 4.00 ppt |
| 2016-06-16 | 1606252-03 | 2.00 ppt |
| 2016-06-16 | 1606252-02 | ND |
| 2016-06-23 | 1606349-01 | 3.00 ppt |
| 2016-06-23 | 1606352-01B | ND |
| 2016-06-23 | 1606351-01 | ND |
| 2016-06-23 | 1606352-01 | ND |
| 2016-06-23 | 1606349-01B | 3.00 ppt |
| 2016-06-23 | 1606351-01B | ND |
| 2016-06-23 | 1606350-01 | ND |
| 2016-06-23 | 1606350-01B | ND |
| 2016-06-30 | K1607569-002 | ND |
| 2016-06-30 | 1607020-01B | ND |
| 2016-06-30 | 1607022-01B | ND |
| 2016-06-30 | K1607569-001 | ND |
| 2016-06-30 | 1607022-01 | ND |
| 2016-06-30 | 1607019-01B | 2.00 ppt |
| 2016-06-30 | 1607021-01B | ND |
| 2016-06-30 | K1607569-004 | ND |
| 2016-06-30 | 1607019-01 | 2.00 ppt |
| 2016-06-30 | 1607020-01 | ND |
| 2016-06-30 | K1607569-003 | ND |
| 2016-06-30 | 1607021-01 | ND |
| 2016-07-07 | 1607086-01 | ND |
| 2016-07-07 | 1607089-01 | 10.00 ppt |
| 2016-07-07 | 1607091-01 | 3.00 ppt |
| 2016-07-07 | 1607091-01B | 3.00 ppt |
| 2016-07-07 | K1607624-005 | 12.3 ppt |
| 2016-07-07 | K1607624-006 | ND |
| 2016-07-07 | K1607618-004 | 10.00 ppt |
| 2016-07-07 | K1607621-004 | ND |
| 2016-07-07 | K1607624-007 | ND |
| 2016-07-07 | K1607621-001 | 7.80 ppt |
| 2016-07-07 | 1607087-01 | 3.00 ppt |
| 2016-07-07 | 1607089-01B | 10.00 ppt |
| 2016-07-07 | K1607618-001 | ND |
| 2016-07-07 | 1607088-01 | 10.00 ppt |
| 2016-07-07 | 1607092-01B | 2.00 ppt |
| 2016-07-07 | K1607624-002 | 14.5 ppt |
| 2016-07-07 | K1607624-004 | ND |
| 2016-07-07 | K1607618-002 | ND |
| 2016-07-07 | K1607621-003 | ND |
| 2016-07-07 | 1607086-01B | ND |
| 2016-07-07 | K1607624-001 | ND |
| 2016-07-07 | 1607092-01 | 2.00 ppt |
| 2016-07-07 | K1607624-003 | ND |
| 2016-07-07 | 1607090-01 | 7.00 ppt |
| 2016-07-07 | 1607087-01B | 3.00 ppt |
| 2016-07-07 | 1607088-01B | 10.00 ppt |
| 2016-07-07 | 1607090-01B | 7.00 ppt |
| 2016-07-07 | K1607618-003 | 11.0 ppt |
| 2016-07-14 | 1607214-01B | 2.00 ppt |
| 2016-07-14 | 1607215-01B | 2.00 ppt |
| 2016-07-14 | 1607212-01 | 3.00 ppt |
| 2016-07-14 | 1607214-01 | 2.00 ppt |
| 2016-07-14 | 1607213-01 | 2.00 ppt |
| 2016-07-14 | 1607213-01B | 2.00 ppt |
| 2016-07-14 | 1607215-01 | 2.00 ppt |
| 2016-07-14 | 1607212-01B | 3.00 ppt |
| 2016-07-21 | 1607276-01B | 3.00 ppt |
| 2016-07-21 | 1607277-01 | 2.00 ppt |
| 2016-07-21 | 1607279-01 | 2.00 ppt |
| 2016-07-21 | 1607276-01 | 3.00 ppt |
| 2016-07-21 | 1607279-01B | 2.00 ppt |
| 2016-07-21 | 1607277-01B | 2.00 ppt |
| 2016-07-21 | 1607278-01 | ND |
| 2016-07-21 | 1607278-01B | ND |
| 2016-07-28 | 1607346-01B | 3.00 ppt |
| 2016-07-28 | 1607345-01B | 2.00 ppt |
| 2016-07-28 | 1607345-01 | 2.00 ppt |
| 2016-07-28 | 1607343-01B | 3.00 ppt |
| 2016-07-28 | 1607346-01 | 3.00 ppt |
| 2016-07-28 | 1607344-01B | 4.00 ppt |
| 2016-07-28 | 1607343-01 | 3.00 ppt |
| 2016-07-28 | 1607344-01 | 4.00 ppt |
| 2016-08-04 | 1608075-03B | ND |
| 2016-08-04 | 1608075-01B | 3.00 ppt |
| 2016-08-04 | 1608075-02B | 2.00 ppt |
| 2016-08-04 | 1608075-04B | 2.00 ppt |
| 2016-08-18 | K1609928-004 | ND |
| 2016-08-18 | K1609928-002 | ND |
| 2016-08-18 | K1609928-003 | ND |
| 2016-08-18 | K1609928-001 | ND |
| 2016-09-01 | K1610468-001 | ND |
| 2016-09-01 | K1610468-003 | ND |
| 2016-09-01 | K1610468-002 | ND |
| 2016-09-07 | K1610695-001 | ND |
| 2016-09-15 | K1611036-001 | 3.70 ppt |
| 2016-09-15 | K1611036-002 | 4.70 ppt |
| 2016-09-15 | K1611036-003 | ND |
| 2016-09-15 | K1611036-004 | ND |
| 2016-09-29 | K1611858-003 | ND |
| 2016-09-29 | K1611858-001 | ND |
| 2016-09-29 | K1611858-002 | 5.10 ppt |
| 2016-09-29 | K1611858-004 | ND |
| 2016-10-13 | K1612679-001 | 6.10 ppt |
| 2016-10-13 | K1612679-003 | ND |
| 2016-10-13 | K1612679-004 | ND |
| 2016-10-13 | K1612679-002 | 5.30 ppt |
| 2016-10-27 | K1613253-002 | 5.40 ppt |
| 2016-10-27 | K1613253-003 | ND |
| 2016-10-27 | K1613253-001 | 6.20 ppt |
| 2016-10-27 | K1613253-004 | 4.50 ppt |
| 2016-11-10 | K1613978-002 | 4.70 ppt |
| 2016-11-10 | K1613978-001 | 4.90 ppt |
| 2016-11-10 | K1613978-004 | ND |
| 2016-11-10 | K1613978-003 | ND |
| 2016-11-16 | K1614222-002 | 5.20 ppt |
| 2016-11-16 | K1614222-001 | 5.80 ppt |
| 2016-11-16 | K1614222-003 | ND |
| 2016-11-16 | K1614222-004 | ND |
| 2016-12-01 | K1614633-002 | ND |
| 2016-12-01 | K1614633-003 | ND |
| 2016-12-01 | K1614633-004 | ND |
| 2016-12-01 | K1614633-001 | 6.10 ppt |
| 2016-12-15 | K1615281-001 | ND |
| 2016-12-15 | K1615281-002 | ND |
| 2016-12-15 | K1615281-003 | ND |
| 2016-12-15 | K1615281-004 | ND |
| 2016-12-28 | K1615500-002 | ND |
| 2016-12-28 | K1615500-003 | ND |
| 2016-12-28 | K1615500-004 | ND |
| 2016-12-28 | K1615500-001 | 5.10 ppt |
| 2017-01-12 | K1700420-003 | ND |
| 2017-01-12 | K1700420-001 | 6.30 ppt |
| 2017-01-12 | K1700420-002 | 15.0 ppt |
| 2017-01-12 | K1700420-004 | ND |
| 2017-01-26 | K1700898-004 | ND |
| 2017-01-26 | K1700898-001 | 6.70 ppt |
| 2017-01-26 | K1700898-002 | ND |
| 2017-01-26 | K1700898-003 | ND |
| 2017-02-09 | K1701387-003 | ND |
| 2017-02-09 | K1701387-001 | 7.60 ppt |
| 2017-02-09 | K1701387-002 | ND |
| 2017-02-09 | K1701387-004 | ND |
| 2017-03-09 | 8888464 | 3.00 ppt |
| 2017-03-09 | 8888465 | 2.00 ppt |
| 2017-05-10 | AB67111 | ND |
| 2017-05-10 | AB67112 | ND |
| 2017-05-10 | AB67121 | ND |
| 2018-02-15 | 9463597 | 3.00 ppt |
| 2018-02-15 | 9463595 | 1.000 ppt |
| 2018-02-15 | 9463596 | 3.00 ppt |
| 2018-02-15 | 9463598 | 2.00 ppt |
| 2018-03-22 | 9520794 | 3.00 ppt |
| 2018-03-22 | 9520791 | 1.000 ppt |
| 2018-03-22 | 9520793 | 3.00 ppt |
| 2018-03-22 | 9520792 | 3.00 ppt |
| 2018-04-19 | 9569131 | 1.90 ppt |
| 2018-04-19 | 9569130 | 2.50 ppt |
| 2018-04-19 | 9569128 | 1.10 ppt |
| 2018-04-19 | 9569129 | 2.20 ppt |
| 2018-05-29 | 9633891 | 1.20 ppt |
| 2018-05-29 | 9633894 | 2.20 ppt |
| 2018-05-29 | 9633892 | 4.40 ppt |
| 2018-05-29 | 9633893 | 3.00 ppt |
| 2018-06-21 | 9674401 | 2.80 ppt |
| 2018-06-21 | 9674402 | 2.20 ppt |
| 2018-06-21 | 9674400 | 5.50 ppt |
| 2018-06-21 | 9674399 | 2.20 ppt |
| 2018-07-19 | 9714348 | 2.10 ppt |
| 2018-07-19 | 9714345 | 1.40 ppt |
| 2018-07-19 | 9714347 | 2.60 ppt |
| 2018-07-19 | 9714346 | 4.30 ppt |
| 2018-08-23 | 9771169 | 5.50 ppt |
| 2018-08-23 | 9771170 | 3.50 ppt |
| 2018-08-23 | 9771168 | 2.30 ppt |
| 2018-08-23 | 9771171 | 2.70 ppt |
| 2018-09-19 | 9812474 | 3.10 ppt |
| 2018-09-19 | 9812471 | 3.20 ppt |
| 2018-09-19 | 9812472 | 4.50 ppt |
| 2018-09-19 | 9812473 | 3.40 ppt |
| 2018-10-25 | 9870339 | 2.40 ppt |
| 2018-10-25 | 9870342 | 1.70 ppt |
| 2018-10-25 | 9870340 | 3.40 ppt |
| 2018-10-25 | 9870341 | 1.90 ppt |
| 2018-11-20 | 9909746 | 2.30 ppt |
| 2018-11-20 | 9909747 | 4.50 ppt |
| 2018-11-20 | 9909749 | 1.90 ppt |
| 2018-11-20 | 9909748 | 2.10 ppt |
| 2018-12-20 | 9952846 | 4.20 ppt |
| 2018-12-20 | 9952845 | 2.60 ppt |
| 2018-12-20 | 9952847 | 2.80 ppt |
| 2018-12-20 | 9952848 | 2.00 ppt |
| 2019-01-17 | 9970055 | 1.40 ppt |
| 2019-01-17 | 9970057 | 2.30 ppt |
| 2019-01-17 | 9970058 | 1.80 ppt |
| 2019-01-17 | 9970056 | 3.70 ppt |
| 2019-02-27 | 9995194 | 2.30 ppt |
| 2019-02-27 | 9995193 | 3.90 ppt |
| 2019-02-27 | 9995195 | 1.80 ppt |
| 2019-02-27 | 9995192 | 1.30 ppt |
| 2019-03-21 | 1015518 | 2.20 ppt |
| 2019-03-21 | 1015517 | 3.80 ppt |
| 2019-03-21 | 1015519 | 2.10 ppt |
| 2019-03-21 | 1015516 | 1.10 ppt |
| 2019-04-18 | 1039203 | 2.00 ppt |
| 2019-04-18 | 1039204 | 3.60 ppt |
| 2019-04-18 | 1039206 | 2.70 ppt |
| 2019-04-18 | 1039205 | 3.10 ppt |
| 2019-05-23 | 1066177 | 2.00 ppt |
| 2019-05-23 | 1066179 | 2.70 ppt |
| 2019-05-23 | 1066180 | 2.30 ppt |
| 2019-05-23 | 1066178 | 5.40 ppt |
| 2019-06-14 | 1081922 | 7.30 ppt |
| 2019-06-14 | 1081924 | 2.90 ppt |
| 2019-06-14 | 1081921 | 1.70 ppt |
| 2019-06-14 | 1081923 | 3.10 ppt |
| 2019-07-25 | 1112058 | 2.20 ppt |
| 2019-07-25 | 1112056 | 6.00 ppt |
| 2019-07-25 | 1112057 | 2.80 ppt |
| 2019-07-25 | 1112055 | 2.30 ppt |
| 2019-08-29 | 1141764 | 2.40 ppt |
| 2019-08-29 | 1141761 | 5.20 ppt |
| 2019-08-29 | 1141762 | 4.70 ppt |
| 2019-08-29 | 1141763 | 3.00 ppt |
| 2019-09-26 | 1163107 | 2.30 ppt |
| 2019-09-26 | 1163104 | 4.90 ppt |
| 2019-09-26 | 1163105 | 5.00 ppt |
| 2019-09-26 | 1163106 | 3.10 ppt |