Backflow Prevention

Backflow Prevention

MPW’s backflow prevention program is designed to protect our community's tap water from accidental contamination that can occur due to cross-connections. A cross-connection is any point where contaminants can "backflow" from the customer's point of use into the public water supply. 

Backflow prevention assemblies must be tested when they are installed and at least once each year after that.  A certified backflow prevention assembly technician must complete testing to ensure that the backflow device is working properly. Testing results should be submitted to MP&W.

New and Existing Water Service Backflow Requirements

Commercial & Industrial (Not used solely for residence)

An approved reduced pressure zone backflow prevention assembly must be installed immediately downstream from the meter.

Residential – Subdivisions (Privately owned water systems)

An approved reduced pressure zone backflow prevention assembly must be installed immediately downstream from the master water meter.

Residential – Single Family Homes & Duplexes

An approved reduced pressure zone backflow prevention assembly for isolation must be installed on branch piping serving a boiler, swimming pool, in-ground irrigation, or a yard hydrant.

Residential – Apartment Buildings & Complexes

An approved reduced pressure zone backflow prevention assembly must be installed immediately downstream of any water meter serving general maintenance purposes or serving a boiler, swimming pool, in-ground irrigation, or a yard hydrant.

Fire Protection Systems

An approved reduced pressure zone backflow prevention assembly must be installed on all new and existing fire protection systems, which have any of the following:

  • Interconnections with auxiliary supplies such as reservoirs, rivers, ponds, wells, mills, or other industrial water systems.
  • Antifreezes or other additives in the fire protection system.
  • Any other facility, connection, or condition that may cause contamination including external connections for a fire department pump truck.

Iowa Containment Requirement and MP&W Policy

The Iowa state plumbing code requires cities with a population of 15,000 or greater to enact a backflow prevention program with a containment system. (Backflow is defined as the unwanted reversal of flow in a drinking water system.) The purpose of a containment system is to protect the quality of drinking water from the time it leaves the water treatment plant until it reaches your home.

Muscatine Power and Water (MP&W) has implemented a policy to safeguard its water distribution system against contamination or pollution by water or other substance flowing into its system from a customer’s system. Our internal policy meets or exceeds the standards set forth in Iowa Administrative Code Section 641.25.5, Backflow Prevention with Containment.

For more information please read the MP&W Water Service Rules, Backflow Prevention section 2-6.

Iowa Registered Backflow Assembly Testers

There are several options in the Muscatine area to begin backflow prevention testing. The Iowa Department of Public Health keeps a complete list of registered backflow prevention assembly testers by county.  MP&W does not perform backflow testing for the public.

Example of a Backflow Device

Reduced Pressure Zone Assembly
Backflow Preventer 2

The Reduced Pressure Zone backflow prevention device offers the most sophisticated level of protection from back flow or back siphonage.

The RP has two independent check valves with a relief valve located directly under the #1 check.  It is designed to protect the public water supply by disposing of any backwards-flowing water if either of the check valves or the relief valve fails.

Submitting Reports

Backflow Test Reports should be submitted to:
Muscatine Power and Water
Attention: Metering & Power Quality Supervisor
3205 Cedar St. Muscatine, IA 52761
Email: pmccleary@mpw.org
Fax: (563)262-3345

For questions contact MPW at (563) 262-3372 or email pmccleary@mpw.org

Business Hours

(Lobby/Drive-Thru)
Monday – Friday
8:00 a.m. – 5:00 p.m.
Phone (563) 263-2631
FAX (563) 262-3373

After hours support is available 7 days a week.