Class B Firefighting Foam - Municipal Well Investigative Sampling Results

Introduction
In February 2009, the Minnesota Department of Health (MDH) began sampling selected municipal water supplies for an expanded list of perfluorochemicals (PFCs) related to Class B firefighting foams. These systems were chosen based on the volume of reported use of Class B firefighting foams in training centers and the vulnerability of the wells.

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Results Table

Results Table

City

Wells Results

Date Sampled

Public Health Action

Apple Valley

Trace amounts noted

2009

PFCs below health based exposure limits

Bemidji

Trace amounts noted

2009

PFCs below health based exposure limits

Brooklyn Center

No detection

2009

PFCs below health based exposure limits

Burnsville

Trace amounts noted

2009

PFCs below health based exposure limits

Cloquet

No detection

2009

PFCs below health based exposure limits

Cottage Grove*

Trace amounts noted

2009

PFCs below health based exposure limits

Goodview

No detection

2009

PFCs below health based exposure limits

Luverne

Trace amounts noted

2009

PFCs below health based exposure limits

North Mankato

No detection

2009

PFCs below health based exposure limits

North St. Paul*

No detection

2009

PFCs below health based exposure limits

Perham

No detection

2009

PFCs below health based exposure limits

Pierz

No detection

2009

PFCs below health based exposure limits

Pine River

No detection

2009

PFCs below health based exposure limits

Randall

No detection

2009

PFCs below health based exposure limits

Richfield

Trace amounts noted

2009

PFCs below health based exposure limits

Rochester

No detection

2009

PFCs below health based exposure limits

Winona

Trace amounts noted

2009

PFCs below health based exposure limits
and the well was scheduled for replacement

*indicates that the laboratory analysis was for List 555 (see below for more information)

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Descriptors for Results

No detection – There was no indication of PFCs in the laboratory analysis.

Trace amounts noted – The laboratory analysis was able to detect a minute amount of PFCs.

PFCs detected above health based exposure limits – The laboratory was able to detect PFCs and the level(s) exceeded the health based exposure limit. MDH is working with the local municipal water system to prevent or reduce exposure.

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Laboratory Analysis
The MDH laboratory currently analyzes water samples for two lists of PFCs, List 555 and List 551.

List 555 was developed earlier. It includes PFCs that are primarily of concern due to disposal sites in south Washington County.

List 551 While most of the PFCs of concern in Class B firefighting foams are included in List 555 (PFOA, PFOS, and PFHxS), one - 6:2 Fluorotelomer Sulfonate (6:2 FtS) – was not. The methodology used to analyze for 6:2 FtS also finds the other five additional chemicals included in List 551.

List 555
Perfluorobutanoic acid (PFBA)
Perfluoropentanoic acid (PFPeA)
Perfluorohexanoic acid (PFHxA)
Perfluorooctanoic acid (PFOA)
Perfluorobutane Sulfonate (PFBS)
Perfluorohexane Sulfonate (PFHxS)
Perfluorooctane Sulfonate (PFOS)

List 551
Perfluorobutanoic acid (PFBA)
Perfluoropentanoic acid (PFPeA)
Perfluorohexanoic acid (PFHxA)
Perfluoroheptanoic acid (PFHpA)**
Perfluorooctanoic acid (PFOA)
Perfluorononanoic acid (PFNA)**
Perfluorodecanoic acid (PFDA)**
Perfluoroundecanoic acid (PFUnDA)**
Perfluorododecanoic acid (PFDoDA)**
Perfluorobutane Sulfonate (PFBS)
Perfluorohexane Sulfonate (PFHxS)
Perfluorooctane Sulfonate (PFOS)
6:2 Fluorotelomer Sulfonate (6:2 FtS)**

**Indicates new chemical added to List 551

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Updated Thursday, 27-Sep-2012 15:13:49 CDT