Danbury Treatment Plant Connection

The Danbury takes the Brookfield wastewater discharge under what is called an Interlocal agreement. That agreement requires Brookfield sewer system users to pay per gallon for operations, plus pay an apportioned amount for plant improvements. In the early part of this decade, Brookfield has used about 3 percent of the total flows handled by the plant. Consequently, Brookfield users pay 3% of the improvements to the Danbury Publicly Owned Treatment Works (POTW).

By the Interlocal agreement, Brookfield is limited to discharge an average of 500,000 gallons per day (GPD), that is 500 MGPD. Slightly more than half of the purchased plant capacity was used since 2006. However, this capacity limit is slated to decrease in 2022 to 380,000 GPD with a significant upgrade of the Danbury Plant upgrade that is slated to have reduced Phosphorus discharge limits.

Original InterLocal Agreement of 1992

Amended InterLocal Agreement of 2014 (This version of the agreement extension was executed and is in place.)

Note: The Interlocal agreement is slated to be updated with the decrease in the Danbury plant capacity in 2022.

See the chart of historical discharges below. The annual outflow seems to ebb and flow with economic activity in Brookfield.

YearAverage Daily Flow, M Gallons Per Day
2018 303.1
2017 286.6
2016 284.7
2015 279.0
2014 276.1
2013 277.4
2012 278.0
2011 289.6
2010 288.0
2009 229.5
2008 258.9
2007 264.8
2006 240.4
2005 232.4
2004 237.9
2003 241.7
2002 239.7
2001 238.6
2000 240.6
1999 226.9
1998 221.8
1997 230.3
1996 230.6
1995 220.2
1994 206.2
1993 184.0
1992 155.6
1991 150.1
1990 153.3
1989 125.0
1988 127.3
1987 127.3
1986 129.6
1985 140.7
1984 95.7
1983 99.5
1982 90.0
1981 73.0

Q & A:

Q: What is the system capacity?

A: The instantanous flow rate of the pumps to Danbury is 2000M Gallons per day. The practical capacity is roughly 50% of that or 1000M, that is, a million gallons per day.

Q: Can Brookfield send that quantity to Danbury for treatment?

A: No. The InterLocal agreement with Danbury limits flow to 500 thousand gallons per day (MGPD) on the average.

Q: With projects currently on the drawing board what is the danger of running out of capacity?

No. There is sufficient capacity through 2022 with the current Danbury agreement and the current capability of the equipment. This Danbury agreement was re-negotiated. A signed agreement was executed December 2014. However, this is slated to be reduced in 2022, with a planned upgrade that will include new Phosphorus removal capability. 

Note: Danbury reports the regional plant is designed for a capacity of 15.5 million gallons per day (MMGPD).  In 2016, the plant currently operated at 9 MMGPD.  Danbury has estimated flows at 11.5 MMGPD 30 years out.  A Danbury Plant Upgrade to remove phosphorus is slated reduce the plant capacity to this 11.5 MMGPD.

Projects in play include: (Updated April 2018)

Development:UnitsNew MGPDStatus
Industrial Units Federal Road256(Project Stalled)
Oak Meadow Condos1207(About 1/2 completed)
Town Center Area756(Under Construction)
Green Acres1008(Project Stalled)
Northern Laurel Hill Road756(Under discussion)
Four Corners Area150?12Condos/Apts/Retail (?)
Recent Projects Completed:(Now included in 2018+ flows)
Barnbeck Condos150(Completed in 2017)
Southern Laurel Hill Road88(Completed late 2015)
Newbury Village125(Completed 2015)
Old New Milford Road20(Completed 2013)
Riverview Condos60(Completed 2015)
Brooks Quarry160Upgraded 2017 (CHFA grant)
Sandy Lane800Re-routed system to gravity
Rollingwood2500Re-routing system to gravity
Possible Future:
Dean Road806Under Discussion
Lake Areas45035Nothing is planned
Whisconier Areas25020Nothing is planned
“Cornfield” propertyN/A< 12for whatever may be built
Others-Long RangeN/A< 20for whatever may be built
Total< 140

Note: These planned and future totals should not exceed the capability of the equipment. A review of the infrastructure will be conducted after the expanded monitoring system is installed.

Separately, a Twenty-Year Plan study was completed to determine if additional capacity from Danbury will need to be increased from the current 500,000 gallon per day limit. This was an exhaustive study looking at all areas of Brookfield where sewers might be installed. It is not anticipated that addiitional treatment capacity will be needed for the next 10 years or so and maybe never.