North Penn Water Authority - Committed to Providing Safe, Reliable, and Economical Water
A dedicated, professional workforce committed to providing the community with a safe, reliable, and economical water supply

Customer Service

Backflow Prevention

Backflow occurs when a sudden drop in pressure causes water to reverse from its normal “forward” flow and back up into a building or without backflow prevention, into the Authority’s water supply lines and its main distribution system.  If water flowing backward contains hazardous chemicals or bacteria, it can create an unhealthy or dangerous situation.  Because of this potential problem, the Safe Drinking Water Act requires that every customer install backflow preventers at their own expense. These devices act as a physical barrier to water flowing in the wrong direction. Backflow prevention devices are installed throughout the North Penn Water Authority’s system to protect the water supply and ultimately its customers. It is the Authority’s critical mission to provide the highest quality water to customers and one of the ways to do that is to ensure that the Authority’s high quality water reaches customers without dilution from any potentially dangerous chemicals as a result of backflow into the Authority’s distribution system. 

Prior to the installation of the backflow device, the volume of water in your home's pipes, which can expand when heated, could flow back into the public water system.  The backflow preventer creates an isolated or closed plumbing system because water can no longer flow back into the Authority’s water system.  Thermal expansion occurs when your hot water heater heats the water, causing it to expand.  This may cause water pressure to build up, particularly when the hot water system is activated. For some customers, thermal expansion could produce leaky faucets or set off the relief valve on hot water heaters, or in some cases, other damage may occur.  While the North Penn Water Authority must ensure safe drinking water reaches all of its customers, it is up to each customer individually to determine what is required for their internal plumbing.  The Authority encourages all customers to consult a certified plumber if you have any doubts about your plumbing system. A plumber may recommend the installation of a thermal expansion tank on your hot water heater. A pressure-reducing valve may also be required if your water pressure exceeds 70 pounds per square inch (psi). 

The North Penn Water Authority is composed of a dedicated, professional workforce that is committed to providing customers with a safe, reliable and economical water supply that exceeds federal standards.  Ensuring that our customers have backflow preventers installed is one of the ways in which we protect that water supply keeping it safe for everyone to use.




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North Penn Water Authority
300 Forty Foot Road
Lansdale, PA 19446
Phone: 215.855.3617
Fax: 215.855.2756
After Hours Emergency Number:
Safe Drinking Water Hotline:
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