PFOA and PFOS Investigation

November, 2019 Update
Subject: PFOA and PFOS Investigation

At the November 2018 Water Commission meeting, additional sampling was approved by the Water Commission at intervals determined by the Water Commission for PFOA and PFOS. The intervals approved are as follows: Sample PFOA and PFOS once per month for two months immediately following the November Commission meeting (December 2018 and January 2019), followed by quarterly PFOA and PFOS samples for the 2019 calendar year (April 2019, July 2019, October 2019). The locations of sampling are the Bay of Green Bay water to be treated, raw drinking water after powder activated carbon addition, and finished drinking water being distributed to the public. Samples have been taken on December 4, 2018 and January 3, 2019, April 15, 2019, July 1, 2019, and October 8, 2019 by Marinette Water and Wastewater Utility staff. Results are listed in the table below for the December 4, 2018, January 3, 2019, April 15, 2019, July 1, 2019, and October 8, 2019 samples.

In 2016 the EPA announced the release of health advisory levels for the PFAS compounds PFOA and PFOS in DRINKING WATER. The health advisory level set forth by the EPA identified the concentration of PFOA and PFOS in drinking water at or below which adverse health effects are not anticipated to occur over a lifetime of exposure. The Health advisory level is 70 parts per trillion for PFOA and PFOS. Health advisory levels are non-regulatory and reflect the EPA’s assessment of the best available peer reviewed science.

Through conversations with the Wisconsin DNR and the City of Marinette Water and Wastewater staff, it has been decided to include ALL detected PFAS compounds in the drinking water being distributed to the public. Results in the table below have been updated to show all PFAS compounds detected in the drinking water samples collected and analyzed.

Drinking Water Analysis: 
(Bolded results indicate water distributed for human consumption)

Sample Location
Sample Date
PFOA (ppt)
LOD=1.2
LOQ=3.9
PFOS (ppt)
LOD=1.7
LOQ=5.3
PFHxA (ppt)
LOD=1.3
LOQ-4.0
PFHpA (ppt)
LOD=0.80
LOQ=2.6
Raw Drinking
Water at Drinking
Water Plant
11-20-2017
[2.11]
[1.87]
[2.04]
[1.04]
Finished Water
at Drinking
Water Plant
11-20-2017
[1.79]
Non-Detectable
[2.34]
[1.03]
High School
11-20-2017
[1.81]
Non-Detectable
[3.13]
[1.05]
Hydrant Next to
New REC Center
11-20-2017
[1.75]
Non-Dectectable
4.11
[1.07]
Raw Drinking
Water from the
Bay of Green Bay
12-4-2018
[3.54]
5.94
[1.8]
[1.09]
Raw Drinking
Water After
Carbon Addition
12-4-2018
[2.69]
[3.14]
[1.78]
[1.01]
Finished
Drinking Water
at Drinking
Water Plant
12-4-2018
[2.08]
[1.95]
[1.66]
[1.14]
Raw Drinking
Water from the
Bay of Green Bay
1-3-2019
[1.87]
Non-Detectable
[1.61]
[0.89]
Raw Drinking
Water After
Carbon Addition
1-3-2019
[2.06]
[1.95]
[1.67]
[0.82]
Finished
Drinking Water
at Drinking
Water Plant
1-3-2019
[2.10]
Non-Detectable
Non-Detectable
[0.86]
Raw Drinking
Water from the
Bay of Green Bay
4-15-2019
[1.93]
[1.96]
[1.36]
[0.99]
Raw Drinking
Water After
Carbon Addition
4-15-2019
[1.3]
[2.03]
[1.34]
[1.01]
Finished
Drinking Water
at Drinking
Water Plant
4-15-2019
[1.68]
Non-Detectable
Non-Detectable
[0.86]
Raw Drinking
Water from the
Bay of Green Bay
7-1-2019
[1.77]
[2.06]
[1.64]
[0.93]
Raw Drinking
Water After
Carbon Addition
7-1-2019
[1.48]
[1.72]
[1.81]
[0.97]
Finished
Drinking Water
at Drinking
Water Plant
7-1-2019
[1.73]
Non-Detectable
[1.98]
[1.12]
Sample Location
Sample Date
PFOA (ppt)
LOD=1.6
LOQ=5.3
PFOS (ppt)
LOD-=2.7
LOQ=9.1
PFHxA (ppt)
LOD=1.3
LOQ=4.3
PFHpA (ppt)
LOD=0.57
LOQ=1.9
Raw Drinking
Water from the 
Bay of Green Bay
10-8-2019
[2.44]
Non-Detectable
[1.87]
[1.02]
Raw Drinking
Water After
Carbon Addition
10-8-2019
[1.94]
Non-Detectable
[1.48]
[0.96]
Finished
Drinking Water
at Drinking
Water Plant
10-8-2019
[1.93]
Non-Detectable
[1.56]
[1.19]

LOD= Limit of Detection:  As low as the instrument can detect.
LOQ= Limit of Quantitation:  As low as the instrument can detect with 100% certainty.
ppt = parts per trillion or nanograms per liter (ng/L)
Non-Detectable = Substance was not found above laboratory limit of detection
[  ] = Substance was found between laboratory limit of detection and limit of quantification 

Note: Not included in this report are the results for 8 other PFAS compounds that we had analyzed that have not been detected in ANY drinking water sample taken. These results for the 8 other compounds were included in the test method run at the contracted laboratory in conjunction with the PFOA and PFOS and can be obtained upon request.

For more information regarding PFAS in the environment please visit https://www.epa.gov/pfas.

July, 2019 Update
Subject: PFOA and PFOS Investigation 

At the November 2018 Water Commission meeting, additional sampling was approved by the Water Commission at intervals determined by the Water Commission for PFOA and PFOS. The intervals approved are as follows: Sample PFOA and PFOS once per month for two months immediately following the November Commission meeting (December 2018 and January 2019), followed by quarterly PFOA and PFOS samples for the 2019 calendar year (April 2019, July 2019, October 2019). The locations of sampling are the Bay of Green Bay water to be treated, raw drinking water after powder activated carbon addition, and finished drinking water being distributed to the public. Samples have been taken on December 4, 2018 and January 3, 2019, April 15, 2019, and July 1, 2019 by Marinette Water and Wastewater Utility staff. Results are listed in the table below for the December 4, 2018, January 3, 2019, April 15, 2019, and July 1, 2019 samples.

The next drinking water samples taken for PFOA and PFOS analysis will be in October 2019.

In 2016 the EPA announced the release of health advisory levels for the PFAS compounds PFOA and PFOS in DRINKING WATER. The health advisory level set forth by the EPA identified the concentration of PFOA and PFOS in drinking water at or below which adverse health effects are not anticipated to occur over a lifetime of exposure. The Health advisory level is 70 parts per trillion for PFOA and PFOS. Health advisory levels are non-regulatory and reflect the EPA’s assessment of the best available peer reviewed science.

Through conversations with the Wisconsin DNR and the City of Marinette Water and Wastewater staff, it has been decided to include ALL detected PFAS compounds in the drinking water being distributed to the public. Results in the table below have been updated to show all PFAS compounds detected in the drinking water samples collected and analyzed.

Drinking Water Analysis: 
(Bolded results indicate water distributed for human consumption)

Sample Location
Sample Date
PFOA (ppt)
LOD=1.2
LOQ=3.9
PFOS (ppt)
LOD=1.7
LOQ=5.3
PFHxA (ppt)
LOD=1.3
LOQ=4.0
PFHpA (ppt)
LOD=0.80
LOQ=2.6
Raw Drinking
Water at Drinking
Water Plant
11-20-2017
[2.11]
[1.87]
[2.04]
[1.04]
Finished Water
at Drinking
Water Plant
11-20-2017
[1.79]
Non-Detectable
[2.34]
[1.03]
High School
11-20-2017
[1.81]
Non-Detectable
[3.13]
[1.05]
Hydrant Next to
New REC Center
11-20-2017
[1.75]
Non-Detectable
4.11
[1.07]
Raw Drinking
Water from the
Bay of Green Bay
12-4-2018
[3.54]
5.94
[1.8]
[1.09]
Raw Drinking 
Water After
Carbon Addition
12-4-2018
[2.69]
[3.14]
[1.78]
[1.01]

Finished
Drinking Water
at Drinking
Water Plant
12-4-2018
[2.08]
[1.95]
[1.66]
[1.14]
Raw Drinking
Water from the
Bay of Green Bay
1-3-2019
[1.87]
Non-Detectable
[1.61]
[0.89]
Raw Drinking
Water After
Carbon Addition
1-3-2019
[2.06]
[1.95]
[1.67]
[0.82]
Finished
Drinking Water
at Drinking
Water Plant
1-3-2019
[2.10]
Non-Detectable
Non-Detectable
[0.86]
Raw Drinking 
Water from the
Bay of Green Bay
4-15-2019
[1.93]
[1.96]
[1.36]
[0.99]
Raw Drinking
Water After
Carbon Addition
4-15-2019
[1.3]
[2.03]
[1.34]
[1.01]
Finished
Drinking Water
at Drinking
Water Plant
4-15-2019
[1.68]
Non-Detectable
Non-Detectable
[0.86]
Raw Drinking
Water from the
Bay of Green Bay
7-1-2019
[1.77]
[2.06]
[1.64]
[0.93]
Raw Drinking
Water After
Carbon Addition
7-1-2019
[1.48]
[1.72]
[1.81]
[0.97]
Finished
Drinking Water
at Drinking
Water Plant
7-1-2019
[1.73]
Non-Detectable
[1.98]
[1.12]

LOD= Limit of Detection:  As low as the instrument can detect.
LOQ= Limit of Quantitation:  As low as the instrument can detect with 100% certainty.
ppt = parts per trillion or nanograms per liter (ng/L)
Non-Detectable = Substance was not found above laboratory limit of detection
[  ] = Substance was found between laboratory limit of detection and limit of quantification 

Note: Not included in this report are the results for 8 other PFAS compounds that we had analyzed that have not been detected in ANY drinking water sample taken. These results for the 8 other compounds were included in the test method run at the contracted laboratory in conjunction with the PFOA and PFOS and can be obtained upon request.

For more information regarding PFAS in the environment please visit https://www.epa.gov/pfas.

April, 2019 Update

Subject: PFOA and PFOS Investigation

At the November 2018 Water Commission meeting, additional sampling was approved by the Water Commission at intervals determined by the Water Commission for PFOA and PFOS. The intervals approved are as follows: Sample PFOA and PFOS once per month for two months immediately following the November Commission meeting (December 2018 and January 2019), followed by quarterly PFOA and PFOS samples for the 2019 calendar year (April 2019, July 2019, October 2019). The locations of sampling are the Bay of Green Bay water to be treated, raw drinking water after powder activated carbon addition, and finished drinking water being distributed to the public. Samples have been taken on December 4, 2018 and January 3, 2019, and April 15, 2019 by Marinette Water and Wastewater Utility staff. Results are listed in the table below for the December 4, 2018, January 3, 2019, and April 15, 2019 samples.

The next drinking water samples taken for PFOA and PFOS analysis will be in July 2019.

In 2016 the EPA announced the release of health advisory levels for the PFAS compounds PFOA and PFOS in DRINKING WATER. The health advisory level set forth by the EPA identified the concentration of PFOA and PFOS in drinking water at or below which adverse health effects are not anticipated to occur over a lifetime of exposure. The Health advisory level is 70 parts per trillion for PFOA and PFOS. Health advisory levels are non-regulatory and reflect the EPA’s assessment of the best available peer reviewed science.

Through conversations with the Wisconsin DNR and the City of Marinette Water and Wastewater staff, it has been decided to include ALL detected PFAS compounds in the drinking water being distributed to the public. Results in the table below have been updated to show all PFAS compounds detected in the drinking water samples collected and analyzed.


Drinking Water Analysis:

Sample Location
Sample Date
PFOA (ppt)
LOD=1.2
LOQ=3.9
PFOS (ppt)
LOD=1.7
LOQ=5.3
PFHxA (ppt)
LOD=1.3
LOQ=4.0
PFHpA (ppt)
LOD=0.80
LOQ=2.6
Raw Drinking
Water at Drinking
Water Plant
11-20-2017
[2.11]
[1.87]
[2.04]
[1.04]
Finished Water
at Drinking
Water Plant
11-20-2017
[1.79]
Non-Detectable
[2.34]
[1.03]
High School
11-20-2017
[1.81]
Non-Detectable
[3.13]
[1.05]
Hydrant Next to
New REC Center
11-20-2017
[1.75]
Non-Detectable
4.11
[1.07]
Raw Drinking 
Water from the
 Bay of Green Bay
12-4-2018
[3.54]
5.94
[1.8]
[1.09]
Raw Drinking
Water After
Carbon Addition
12-4-2018
[2.69]
[3.14]
[1.78]
[1.01]
Finished
Drinking Water
at Drinking
Water Plant
12-4-2018
[2.08]
[1.95]
[1.66]
[1.14]
Raw Drinking
Water from the
Bay of Green Bay
1-3-2019
[1.87]
Non-Detectable
[1.61]
[0.89]
Raw Drinking
Water After
Carbon Addition
1-3-2019
[2.06]
[1.95]
[1.67]
[0.82]
Finished
Drinking Water
at Drinking
Water Plant
1-3-2019
[2.10]
Non-Detectable
Non-Detectable
[0.86]
Raw Drinking
Water from the
Bay of Green Bay
4-15-2019
[1.93]
[1.96]
[1.36]
[0.99]
Raw Drinking
Water After
Carbon Addition
4-15-2019
[1.3]
[2.03]
[1.34]
[1.01]

Finished
Drinking Water
at Drinking
Water Plant
4-15-2019
[1.68]
Non-Detectable
Non-Detectable
[0.86]

(Bolded results indicate water distributed for human consumption)

LOD= Limit of Detection: As low as the instrument can detect.

LOQ= Limit of Quantitation: As low as the instrument can detect with 100% certainty.

ppt = parts per trillion or nanograms per liter (ng/L)

Non-Detectable = Substance was not found above laboratory limit of detection

[ ] = Substance was found between laboratory limit of detection and limit of quantification

Note: Not included in this report are the results for 8 other PFAS compounds that we had analyzed that have not been detected in ANY drinking water sample taken. These results for the 8 other compounds were included in the test method run at the contracted laboratory in conjunction with the PFOA and PFOS and can be obtained upon request.

For more information regarding PFAS in the environment please visit https://www.epa.gov/pfas.


February, 2019 Update

Subject: PFOA and PFOS Investigation

At the November 2018 Water Commission meeting, additional sampling was approved by the Water Commission at intervals determined by the Water Commission for PFOA and PFOS. The intervals approved are as follows: Sample PFOA and PFOS once per month for two months immediately following the November Commission meeting (December 2018 and January 2019), followed by quarterly PFOA and PFOS samples for the 2019 calendar year (April 2019, July 2019, October 2019). The locations of sampling are the Bay of Green Bay water to be treated, raw drinking water after powder activated carbon addition, and finished drinking water being distributed to the public. Samples have been taken on December 4, 2018 and January 3, 2019 by Marinette Water and Wastewater Utility staff. Results are listed in the table below for the December 4, 2018 and January 3, 2019 samples.

The next drinking water samples taken for PFOA and PFOS analysis will be in April 2019.

In 2016 the EPA announced the release of health advisory levels for the PFAS compounds PFOA and PFOS in DRINKING WATER. The health advisory level set forth by the EPA identified the concentration of PFOA and PFOS in drinking water at or below which adverse health effects are not anticipated to occur over a lifetime of exposure. The Health advisory level is 70 parts per trillion for PFOA and PFOS. Health advisory levels are non-regulatory and reflect the EPA’s assessment of the best available peer reviewed science.

Drinking Water Analysis:

Sample Location
Sample Date
PFOA (ppt)
LOD=1.2
LOQ=3.9
PFOS (ppt)
LOD=1.7
LOQ=5.3
Raw Drinking Water from
the Bay of Green Bay
12-4-2018
[3.54]
5.94
Raw Drinking Water After
Carbon Addition
12-4-2018
[2.69]
[3.14]
Finished Drinking Water
at Drinking Water Plant
12-4-2018
[2.08]
[1.95]
Raw Drinking Water from
the Bay of Green Bay
1-3-2019
[1.87]
Non-Detectable
Raw Drinking Water After
Carbon Addition
1-3-2019
[2.06]
[1.95]
Finished Drinking Water
at Drinking Water Plant
1-3-2019
[2.10]
Non-Detectable

ppt = parts per trillion or nanograms per liter (ng/L)

Non-Detectable = Substance was not found above laboratory limit of detection

[  ] = Substance was found between laboratory limit of detection and limit of quantification

Note: Not included in this report are the results for other PFAS compounds that we had analyzed that do not have a health advisory limit set forth by any regulatory agency. These results were included in the test method run at the contracted laboratory in conjunction with the PFOA and PFOS and can be obtained upon request.

For more information regarding PFAS in the environment please visit https://www.epa.gov/pfas.

January, 2019 Update

Subject: PFOA and PFOS Investigation

At the November 2018 Water Commission meeting, additional sampling was approved by the Water Commission at intervals determined by the Water Commission for PFOA and PFOS. The intervals approved are as follows: Sample PFOA and PFOS once per month for two months immediately following the November Commission meeting (December 2018 and January 2019), followed by quarterly PFOA and PFOS samples for the 2019 calendar year (April 2019, July 2019, October 2019). The locations of sampling are the Bay of Green Bay water to be treated, raw drinking water after powder activated carbon addition, and finished drinking water being distributed to the public. Samples have been taken on December 4, 2018 and January 3, 2019 by Marinette Water and Wastewater Utility staff. Results are listed in the table below for the December 4, 2018 sample. Results have not been generated for the January 3, 2019 sample due to analysis time; the utility will update when results are available.

In 2016 the EPA announced the release of health advisory levels for the PFAS compounds PFOA and PFOS in DRINKING WATER. The health advisory level set forth by the EPA identified the concentration of PFOA and PFOS in drinking water at or below which adverse health effects are not anticipated to occur over a lifetime of exposure. The Health advisory level is 70 parts per trillion for PFOA and PFOS. Health advisory levels are non-regulatory and reflect the EPA’s assessment of the best available peer reviewed science.

As part of the ongoing investigation of the transport of the contaminants through Marinette’s wastewater collection and treatment system, Wastewater Utility Staff collected samples directly from industries where previous manhole sampling, done on 7-9-2018, showed elevated results in the wastewater collection system areas. The industries sampled were Tyco/JCI on Industrial Parkway South, Tyco/JCI on Stanton Street, and ChemDesign Products Incorporated. The results of the investigative sampling are listed in the table below.

Drinking Water Analysis:

Sample Location
Sample Date
PFOA (ppt)
LOD=1.2
LOQ=3.9
PFOS (ppt)
 LOD=1.7
LOQ=5.3
Raw Drinking Water from the Bay of Green Bay
12-4-2018
[3.54]
5.94
Raw Drinking Water After Carbon Addition
12-4-2018
[2.69]
[3.14]
Finished Drinking Water at Drinking Water Plant
12-4-2018
[2.08]
[1.95]

ppt = parts per trillion or nanograms per liter (ng/L)

Non-Detectable = Substance was not found above laboratory limit of detection

[  ] = Substance was found between laboratory limit of detection and limit of quantification

Wastewater Analysis:

Sample Location
Sample Date
PFOA (ppt)
PFOS (ppt)
Tyco/JCI Industrial Parkway South Wastewater
12-6-2018
253
3670
Tyco/JCI Stanton Street Wastewater
12-6-2018
116
7.1
ChemDesign Wastewater
12-6-2018
1120
48.3

ppt = parts per trillion or nanograms per liter (ng/L)

Non-Detectable = Substance was not found above laboratory limit of detection

[  ] = Substance was found between laboratory limit of detection and limit of quantification

Note: Not included in this report are the results for other PFAS compounds that we had analyzed that do not have a health advisory limit set forth by any regulatory agency. These results were included in the test method run at the contracted laboratory in conjunction with the PFOA and PFOS and can be obtained upon request.

For more information regarding PFAS in the environment please visit https://www.epa.gov/pfas.

November, 2018

Subject:  PFOA and PFOS Investigation

Over the past year the Marinette Water and Wastewater Utility staffs have been undertaking sampling and testing measures to understand the extent and impact of PFOA and PFOS contamination in our community as it pertains to both our municipal water and municipal wastewater. The City of Marinette officials gave the directive to initiate sampling of the public drinking water system at multiple locations, the wastewater collection and treatment systems at multiple locations, and all private drinking water wells located in the city limits.

In regards to the drinking water sampling frequency, we have sampled only once due to the results either being between the limit of detection and limit of quantification, and in some cases non-detectable. In response to public concerns and questions from city officials, our intention is to discuss at our November 2018 Water Commission meeting additional sampling approval from the Water Commission at intervals determined by the Water Commission for PFOA and PFOS. The locations of sampling would be the Bay of Green Bay water to be treated, raw drinking water after powder activated carbon addition, and finished drinking water being distributed to the public. If the additional sampling indicates continued low concentration results, the frequency of sampling could be decreased as determined by the Water Commission.

City officials requested that the Marinette Water Utility staff sample private drinking water wells located in the City of Marinette, which TYCO/JCI did not sample, for PFOA and PFOS. The results for this sampling are also listed in this report.

In 2016 the EPA announced the release of health advisory levels for the PFAS compounds PFOA and PFOS in DRINKING WATER. The health advisory level set forth by the EPA identified the concentration of PFOA and PFOS in drinking water at or below which adverse health effects are not anticipated to occur over a lifetime of exposure. The Health advisory level is 70 parts per trillion for PFOA and PFOS. Health advisory levels are non-regulatory and reflect the EPA’s assessment of the best available peer reviewed science.

After reporting our findings from Wastewater Influent and Effluent sampling to the Wisconsin DNR a request was made from them to also sample the wastewater biosolids. When the results from the 5-23-2018 biosolids sampling were submitted to the DNR, they had inquired if we had the storage capacity to hold our biosolids until they had more time to investigate appropriate biosolids spreading guidance. We had informed them that we did have the capacity to hold biosolids for up to November of 2019. On 9-10-2018 the Wisconsin DNR made a formal request for Marinette to hold our biosolids for this year (2018).

What we have found has been both interesting and informative and the results are outlined in the tables below.

Drinking Water Analysis:

Sample Location
Sample Date
PFOA (ppt)
LOD=1.2
LOQ=3.9
PFOS (ppt)
LOD=1.7
LOQ=5.3
Raw Drinking Water at
Drinking Water Plant
11-20-2017
[2.11]
[1.87]
Finished Water at
Drinking Water Plant
11-20-2017
[1.79]
Non-Detectable
High School
11-20-2017
[1.81]
Non-Detectable
Hydrant Next to 
New REC Center
11-20-2017
[1.75]
Non-Detectable

ppt = parts per trillion or nanograms per liter (ng/L)

Non-Detectable = Substance was not found above laboratory limit of detection

[  ] = Substance was found between laboratory limit of detection and limit of quantification

Private Drinking Water Well Analysis:

Sample Location
Sample Date
PFOA (ppt)
PFOS (ppt)
2907 Taylor Street
6-14-2018
3.44
LOD=0.70
LOQ=2.2
Non-Detectable
LOD=1.5
LOQ=4.7
4030 Hall Ave
6-14-2018
Non-Detectable
LOD=0.70
LOQ=2.2
Non-Detectable
LOD=1.5
LOQ=4.7
2017 Marinette Ave
6-14-2018
3.64
LOD=0.70
LOQ=2.2
Non-Detectable
LOD=1.5
LOQ=4.7
2025 Marinette Ave
6-14-2018
Non-Detectable
LOD=0.70
LOQ=2.2
Non-Detectable
LOD=1.5
LOQ=4.7
2033 Marinette Ave
6-14-2018
Non-Detectable
LOD=0.70
LOQ=2.2
Non-Detectable
LOD=1.5
LOQ=4.7
4161 Frontage Road
7-27-2018
[2.35]
LOD=1.2
LOQ=3.9
Non-Detectable
LOD=1.7
LOQ=5.3

ppt = parts per trillion or nanograms per liter (ng/L)

Non-Detectable = Substance was not found above laboratory limit of detection

[  ] = Substance was found between laboratory limit of detection and limit of quantification

Wastewater Analysis:

Sample Location
Sample Date
PFOA (ppt)
PFOS (ppt)
Wastewater Influent
11-20-2017
34.3
9.28
Wastewater Effluent
11-20-2017
38.2
42.8
Wastewater Influent
5-14-2018
43.5
25.4
Wastewater Effluent
5-14-2018
50.3
13.3
Manhole #428
7-9-2018
9.92
Non-Detectable
Manhole #346A
7-9-2018
41.5
Non-Detectable
Manhole #433
7-9-2018
38.2
211
Manhole #700A
7-9-2018
10.3
Non-Detectable
Manhole #001A
7-9-2018
178
Non-Detectable

ppt = parts per trillion or nanograms per liter (ng/L)

Non-Detectable = Substance was not found above laboratory limit of detection

[  ] = Substance was found between laboratory limit of detection and limit of quantification

Biosolids Analysis:

Sample Location
Sample Date
PFOA (ug/Kg)
PFOS (ug/Kg)
Biosolids Holding Tank
5-23-2018
10
210
Biosolids Holding Tank
9-25-2018
Results Pending
Results Pending

Note: Not included in this report are the results for other PFAS compounds that we had analyzed that do not have a health advisory limit set forth by any regulatory agency. These results were included in the test method run at the contracted laboratory in conjunction with the PFOA and PFOS and can be obtained upon request.

For more information regarding PFAS in the environment please visit https://www.epa.gov/pfas.