RESOLVED – DBP MCL VIOLATIONS

Posted on Jan 6, 2020

IMPORTANT INFORMATION ABOUT YOUR DRINKING WATER

NOTICE OF STANDARD MAXIMUM CONTAMINANT LEVEL (MCL) VIOLATIONS

RESOLVED

The Sugarloaf Water Association, PWSID: ME0091690, has resolved the drinking water standards violation regarding disinfection byproducts that you received notice of in February, 2019. Recent testing has confirmed that the SWA water system is operating in full compliance with all federal and state drinking water requirements.

SWA has made the following modifications to our water treatment and operations to reduce the risk of disinfection byproducts in your drinking water by:

1. Maximizing the use of our groundwater wells to supply water to the system. Groundwater does not present the same risk of elevated disinfection byproducts as does the Carrabassett River water supply. From April 1, 2019 through December 31, 2019, our groundwater wells supplied 90.73% of our total system needs. The Carrabassett River supply operated for 30 days and supplied 9.27% of the total system demand.

2. Altering our chemical addition and filtration processes when the Carrabassett River water supply is needed in order to specifically lower Haloacetic acid (HAA5) levels while maintaining effective protection against microbial contamination through disinfection.

We are required to monitor your drinking water for specific contaminants on a regular basis. For disinfection byproducts, compliance is determined using a locational running annual average (LRAA).  The LRAA is determined by averaging all the samples collected at a particular monitoring location during the previous four calendar quarters. The LRAA standard for Haloacetic Acids (HAA5) is 60 ppb. Testing results beginning in the 4th quarter of 2018 showed that our system exceeded the maximum contaminant level (MCL) for HAA5 when calculating the LRAA. Using the LRAA, elevated levels continued through 2019.

Testing results for the 4th quarter of 2019 show that our system is now back in compliance when calculating the LRAA for HAA5.

2018 HAA5 Test Results

1st Qtr

3/20/2018

49.00

2nd Qtr

6/12/2018

108.00

3rd Qtr

9/4/2018

4.60

4th Qtr

12/11/2018

212.00

LRAA:

93.40

2019 HAA5 Test Results

1st Qtr

3/6/2019

88.00

2nd Qtr

6/12/2019

20.00

3rd Qtr

9/4/2019

22.00

4th Qtr

12/6/2019

9.20

LRAA:

34.80

 

 

 

The tables above indicate that the modifications to our water treatment and operations to reduce the risk of HAA5 have been successful. Our team will continue to monitor HAA5 and make further modifications to our water treatment and operations as required to ensure that the HAA5 LRAA remains below the MCL of 60 ppb.

Please be assured that our team works continually to provide you with a dependable supply of safe water. We are committed to ensuring the quality of your water.

Sincerely,

TEAM SWA

Eric, Josh, James and Ryan

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