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City News

Posted on: September 26, 2019

Water Quality Report Open House

On September 26, 2019 the City held a Water Quality Report Open House.

Topics covered included…

Water System Components 

The City of DuPont currently uses groundwater from five (5) wells for its public water supply. The City’s water supply wells are located at Bell Hill (3) and Hoffman Hill (2).

Additional booster pumps were placed into service in 2003 to provide adequate pressure to customers on Hoffman Hill. All City wells access deep aquifers, making them less susceptible to contaminants.

The City has two active storage reservoirs: A 3.0 million-gallon reservoir at Hoffman Hill, and a 1.0 million-gallon reservoir at Bell Hill. The only treatment used on DuPont’s groundwater sources is the addition of small amounts of chlorine to provide disinfection.

Water Quality 

Click the link below to view the 2018 Water Quality Report.

Groundwater Wells and Aquifers 

Bell Hill Wells 1 and 3 draw water from the Red Salmon Springs Aquifer; Bell Hill Well 2 draws water from the deeper undifferentiated Outwash/Lakewood Glacier Aquifer. Hoffman Hill Wells 1 and 2 draw water from the Red Salmon Springs Aquifer

Capital Improvements 

Bell Hill Improvements

Bell Hill Well 1 Rehabilitation

Bell Hill Booster Station Upgrades

Bell Hill Well 1 Building and Chlorination System

These improvements provided variable frequency drives (VFDs) and soft-start drives for the Bell Hill Wells, provided cleaning for Well 1, constructed an enclosure around Well 1, and installed an onsite chlorine generation system.

Hoffman Hill Improvements

Hoffman Hill Booster Station Upgrades

Hoffman Hill Reservoir Interior Recoating

This work included replacing two pumps and two variable frequency drives (VFDs) at the Hoffman Hill Booster Station. The reservoir recoating project will replace the interior coating in the Hoffman Hill Reservoir.

Historic Village Improvements

Historic Village Water Mains - 2,800 feet of 8-inch water main.

Historic Village Well Demolition – Decommissioned two unused wells.


The 1996 amendments to the Safe Drinking Water Act (SDWA) require that once every five years, the U.S. Environmental Protection Agency (EPA) issue a new list of no more than 30 unregulated contaminants to be monitored by public water systems (PWSs).

What is PFAS? 

Per- and polyfluoroalkyl substances (PFAS) are a diverse group of compounds resistant to heat, water and oil. For decades (1940), they have been used in hundreds of industrial applications and consumer products such as carpeting, clothing, upholstery, food paper wrappings, fire-fighting foams and metal plating.

Emerging PFAS Requirements 

DuPont water is safe and meets all State and Federal limits.

• DuPont is monitoring the emerging PFAS requirements.

• DuPont is sampling each of its 5 wells for PFAS.

• If treatment is required, a Granulated Activated Carbon (GAC) system will be implemented. This would be similar to an industrial sized “Brita” filter. Estimated cost of $3M each at Bell Hill and Hoffman Hill Water Facilities.

The City of DuPont is committed to supplying its customers with high-quality and aesthetically-pleasing drinking water.

Thank you to Public Works, Gray & Osborne, and all those that attended.

For more information regarding the City’s water visit

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