Jan. 8 Update: City begins work on temporary water treatment facility At its Jan. 8, 2020, meeting, the Woodbury City Council took actions to expedite the construction of a temporary water treatment facility that will treat three of the city’s six water wells that currently exceed water quality standards for PFAS.
The 3M Company made PFAS at its Cottage Grove facility from the late 1940s until 2002. PFAS wastes were disposed of at multiple sites in Washington County. The source of the PFAS in Woodbury’s groundwater has been identified as these disposal sites.
The Minnesota Department of Health has established health standards for PFAS and has issued health risk advisories on six of Woodbury’s 19 wells since 2017.
The city has taken all six of these wells off-line, and water delivered to customers continues to meet all state and federal water quality standards. However, it is critical the city implement temporary treatment options as soon as possible to allow the city to meet water demand on peak use days in summer 2020. If a temporary treatment option cannot be implemented in summer 2020, increased water restrictions may be needed to ensure the water system has enough pressure to meet demand.
3M and the State of Minnesota are funding the construction of the temporary water treatment facility, which will be located in the Tamarack well field north of Valley Creek Road and east of Tower Drive. City staff is working with its consultant AE2S and the State of Minnesota to design the facility, and will be collecting and incorporating feedback from the neighborhood.
The temporary water treatment facility is expected to be in operation until a long-term water treatment solution can be implemented, expected to be around 2025. The State of Minnesota continues to study long-term treatment options for several communities in the east metro area and is expected to share its recommendations with the cities in spring 2020. Funds for long-term water treatment solutions in the east metro are expected to be available through the $720 million settlement the state received from 3M in 2018.
Questions about Woodbury’s water system should be directed to Jim Westerman, utilities manager, at 651-714-3720 or jim.westerman@woodburymn.gov.
Remediation Activities In 2011, the Minnesota Pollution Control Agency (MPCA) completed remediation activities at these sites to reduce the amount of pollutants released from these sites in the future.
3M, under direction from the MPCA, continues active site remediation. For the Woodbury site, remaining contamination is captured by pumping approximately 1.25 billion gallons of water annually to a treatment plant and discharging it to the Mississippi River.
Visit the MPCA website for more information about the remediation activities.
Private Water Supply Wells As a result of the EPA’s new guidance and MDH updated HBV for PFOA and PFOS, MDH is sampling private wells within Washington County and will issue additional drinking water advisories as needed. Until their private wells are tested, residents who have concerns about their health can take steps to reduce their potential exposure to PFAS. Information on point-of-use filters and other steps people can take in their homes can be found on the MDH website.
Residents who have questions about their private water supply well and whether it is impacted by this change should contact MDH.
Oct. 24 Update: Public Meeting held at Woodbury High School
The Minnesota Pollution Control Agency (MPCA) and the Minnesota Department of Natural Resources (DNR) held two public informational meetings to discuss their ongoing efforts to provide safe drinking water to area residents. Watch the video below for the updates, and visit the 3M PFAS Settlement website to learn more.
Oct. 18, 2019 Update: Sixth Woodbury Well has PFAS levels above health risk limit
On Friday, Oct. 18, the Minnesota Department of Health (MDH) issued a notice of health risk advisory for levels of poly- and perfluoroalkyl substances (PFAS) in a sixth Woodbury municipal water production well. Because some of the PFAS chemicals found in the drinking water can cause health effects based on daily consumption over a lifetime, the State of Minnesota calculates a health risk index (HRI) to determine if the combined health risk exceeds a certain level.
Woodbury immediately made operational changes to its water system that will reduce use of the impacted well. Of Woodbury’s 19 municipal wells, water from six wells – based on the most current data – now have detectable levels of PFAS that on repeatable occasion exceed one or more thresholds established by the MDH. Several of these exceedances are only slightly above the heath parameters and have been below those values on prior sampling events. The MDH recommendations are based on daily consumption over a lifetime and have been developed to be protective of the most vulnerable. To learn more about PFAS, visit the MDH website or contact the MDH Site Assessment and Consultation Unit at 651-201-4897 or health.hazard@state.mn.us.
Woodbury’s drinking water continues to meet State of Minnesota and Federal PFAS standards. The city – in coordination with MDH – has made operational changes limiting the use of the six impacted wells. Staff will be evaluating the water system’s ability to meet demand on peak use days in summer of 2020 with six of its 19 wells in reduced operation due to the presence of PFAS.
The city’s highest priority is the health and safety of its residents. Woodbury will continue working with the MDH to monitor, assess and sampling of its water. The public will be informed if/when new changes are detected.
Aug. 28, 2019 Update: Expedited project awarded to and accepted by Woodbury
To help provide immediate assistance to communities impacted by PFAS, the state made a portion of the 3M Settlement dollars available early to help fund projects. Following a state submission and review process, Woodbury received $96,000 to study the level of effectiveness of “mixing” groundwater from clean wells with groundwater from wells with levels of PFAS that exceed the Health Risk Index for PFAS. The Minnesota Department of Health has indicated that “mixing” is an acceptable solution to treating PFAS contaminated wells. Woodbury has sought verification as to how well the technique is or may work in its municipal water supply.
Preliminary results of the testing were received by staff in November 2019 and indicated that temporary treatment solutions were necessary to meet summer demand for water (see Jan. 9 update above). The final report will be published when complete.
April 3, 2019 Update: Minnesota Department of Health issues new Health-Based Guidance Values
The Minnesota Department of Health (MDH) issued new Health-Based Guidance Values (HBVs) for two chemicals in the group of chemicals known as perfluoroalkyl substances (PFAS), PFOS and PFHxS. The new PFOS value of 15 parts per trillion (ppt) replaces the 2017 value of 27 ppt. Only recently has enough scientific data been available to derive a value for PFHxS; the new HBV for PFHxS is 47 ppt. It replaces MDH’s previous approach of using the PFOS HBV as a “surrogate” for PFHxS.
The city changed its well operations to limit the use of the wells impacted by PFAS above established thresholds. These wells are only needed when water demand is high during summer months; when they are in operation, they are used as sparingly as possible and in a rotation with other wells that are not impacted by PFAS. Because of these existing operational changes, MDH indicated to city staff that no additional operational changes to the city’s water system are needed at this time. The water remains safe to drink.
March 2, 2018 Update: $850 million settlement provides funding for cleaning up drinking water
In 2010, Minnesota’s attorney general sued 3M Company alleging that the company’s production of chemicals known as PFAS had damaged drinking water and natural resources in the southeast Twin Cities metro area, including Woodbury. On Feb. 20, 2018, the State of Minnesota and 3M reached a settlement agreement, with the state receiving a grant from 3M for $850 million.
The court-approved agreement specifically outlines providing a clean, sustainable supply of drinking water as a top priority. It also indicates that improvements will be primarily focused on the cities of Woodbury, Afton, Cottage Grove, Lake Elmo, Newport, Oakdale, St. Paul Park and the townships of Grey Cloud Island and West Lakeland. Projects could include treating drinking water from existing wells, providing alternative sources of drinking water for cities or private well owners, or connecting homes served by private wells to municipal drinking water systems.
While the city's water is safe to drink today, there have been significant operational changes made due to the presence of PFAS in the aquifer. The city looks forward to working with the state agencies and other impacted communities to develop water treatment solutions that will provide safe drinking water for generations to come.
