Alum Treatment for Upper & Lower Artichoke Reservoirs

The City of Newburyport is seeking bids for alum treatment for the Upper and Lower Artichoke Reservoirs. The reservoirs have reached a tipping point and need immediate action to reduce nutrients feeding toxic cyanobacteria blooms. The City has managed cyanobacteria blooms since 2020 using copper sulfate, but blooms in 2025 showed resistance to treatments and higher doses were needed to trigger any response in the bloom. The City is seeking other management options for long-term, sustainable remediation of the reservoirs. • The bid includes the treatment of the Upper and Lower Artichoke Reservoirs • The City is seeking a long-term, sustainable solution for the remediation of the reservoirs • The bid opening date is 03/05/2026 11:00:00 AM • A pre-bid/site visit will take place on 02/25/2026 9:00 AM at the Storey Avenue Pump Station