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Backflow preventers on home irrigation systems

Posted on 12/27/25 at 4:56 am
Posted by gungho
Member since Jun 2016
218 posts
Posted on 12/27/25 at 4:56 am
Is it state law that backflow preventer valves on home systems be tested and certified annually? How is this enforced and how much does it cost in your area? Had one in Shreveport and never heard of this until I recently moved to Lincoln parish
Posted by habz007
New Orleans
Member since Nov 2007
4847 posts
Posted on 12/27/25 at 6:34 am to
It’s really hard to get them off once they’re secured.

I had a full master bedroom and master bathroom addition / remodel to our old house several years back with new pool built. My pool builder told me to put them on (because he said they’re somehow dicks about this).

The inspector came and spent all of two minutes. The only damn thing he cared about was seeing the damn back flow preventers and then he left. I didn’t even lock them in place. I took them off when he left.

What a joke



Edit: I live in New Orleans metro area. My current home was built in 1999. There are no back flow preventers anywhere. No one is coming or checking. It’s a non issue. I’m sure an inspector would care if someone applied for permits for something.

Those things are problematic. They leak. They spray. They screw with water pressure over time. I can’t imagine living somewhere where you’re threatened to have your water cutoff and need to have yearly inspections.

Neither old house or “new” house pool tied into water line.
This post was edited on 12/27/25 at 8:32 pm
Posted by sledgehammer
SWLA
Member since Oct 2020
6792 posts
Posted on 12/27/25 at 6:57 am to
Personally, I wouldn’t get one since it’s at your residence. It’s code to have one at your commercial establishment. Our company tests hundreds of BFPs every year (firewater, domestic, and pvbs for irrigation) at businesses but never at someone’s house.
Posted by Daponch
Da Nortchore
Member since Mar 2013
1137 posts
Posted on 12/27/25 at 8:34 am to
Backflows are supposed to be inspected yearly according to state law. A backflow prevention specialist is certified to do this. Most people only do it if their water company enforces it. Just like everything else, the state of Louisiana is only concerned about collecting fees. They don’t enforce the law
Posted by fightin tigers
Downtown Prairieville
Member since Mar 2008
76425 posts
Posted on 12/27/25 at 9:48 am to
quote:

Personally, I wouldn’t get one since it’s at your residence.


You'd be crazy not to get one and install it properly if you are tying a sprinkler system into your drinking water.

As for inspecting you can do it yourself for piece of mind. Just hook a hose on the downstream side and open the bleeder on the upstream side and see if it holds.
Posted by cgrand
HAMMOND
Member since Oct 2009
46777 posts
Posted on 12/27/25 at 10:50 am to
backflows are installed on irrigation systems for a reason. You do not want irrigation line water back flowing into your drinking water and the city/parish/town doesn’t want it in the mains either. It’s a public health issue.

Commercial systems are required to be inspected every year, usually it’s a plumber that does it. I have no idea about residential but if you’ve received a notice (backflow prevention is a permitted activity) then you should have it inspected it’s a minor issue
Posted by bamarep
Member since Nov 2013
52398 posts
Posted on 12/27/25 at 12:49 pm to
Backflow preventers outside of a building sprinkler system are a ripoff.
Posted by TBoy
Kalamazoo
Member since Dec 2007
27594 posts
Posted on 12/27/25 at 3:26 pm to
If you have an automatic sprinkler system or a pool that is tied directly to a freshwater source, you must have a backflow preventer on that line, and it is required to be tested annually. When we are late with the inspection report they threaten to shut off the water to that meter.
Posted by LSU0358
Member since Jan 2005
8095 posts
Posted on 12/28/25 at 8:02 am to


The idea is they prevent contaminants from flowing from your sprinkler heads or just water in the lines of the system back into the main which could in theory happen if the main depressures. On a pool if a pump could be lined up to put pressure (shouldn't be built that way these days but I've seen it on some older designs) on your water supply it could actually be needed.
This post was edited on 12/28/25 at 8:29 am
Posted by Daponch
Da Nortchore
Member since Mar 2013
1137 posts
Posted on 12/28/25 at 10:46 am to
Residential backflows are regulated by local water systems. They are supposed to be inspected yearly as well. The state inspects the systems. There is no regulation of private water wells that I am aware of.
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