Delaware Engineering D.P.C.

Delaware Engineering D.P.C.


Village of Suffern

Wastewater Treatment Plant Upgrades

Estimated Cost:
$9 million

Facility Capacity:
1.8 MGD

Delaware Engineering has been assisting the Village of Suffern with planning, permitting, funding, and designing a WWTP upgrade since January of 2019. Prior to Delaware’s involvement, 6 of 8 unit processes were off-line or unable to function, the plant was struggling to meet interim discharge limits, and the Village was in violation of the compliance schedule specified by a 2011 NYSDEC consent order.

Within the span of one year, Delaware Engineering organized a regulatory compliance meeting with NYSDEC staff, secured an extension on the Order of Consent compliance schedule, completed a Preliminary Engineering Report, and secured a $2.25 million Water Infrastructure Improvement Act (WIIA) grant to support upgrades to the WWTP.

The proposed $9 million upgrade involves rehabilitating the trickling filters, replacing the mechanical aeration system with a movable bed biological reactor (MBBR), upgrading the headworks, and adding storm and flood resiliency measures. 

Construction will be phased, and Delaware prepared the financing applications needed to secure low-cost short-Term construction financing from NYSEFC. 

Delaware is in the process of applying for a new SPDES permit, and staff are currently in design for the first phase of construction (upgraded headworks). The headworks project is expected to go out to bid in 2021, with construction completed by the end of 2022.  

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