Septic distribution box inspection - US EPA Septic System D-Box Covers
Function of the Cover on a Septic System Drop Box; Cover Leaks, Cover Safety

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Septic system drop box cover installation, repair, requirements: why we need a safe, water-tight cover over the septic system D-box.

Septic system D box installation, specifications, inspection, diagnosis, and repair: in this article series about septic system drop boxes we describe the best procedures for locating and inspecting, repairing or replacing the septic drainfield distribution box, or the "D-box" or "Splitter box".

Green links show where you are. © Copyright 2017, All Rights Reserved.

Distribution Box Cover Troubleshooting & Repair

Septic D box in trouble (C) Daniel Friedman N DayQuestion: How to repair a bad D-box lid or cover

My D box is level, it flows nicely and is made of concrete. Unfortunately the lid has failed and the sides are starting to crumble. Do I have to replace the whole box or could I simply form and pour concrete around the old one? Would this be an acceptable repair method? - Scott 5/1/12


Scott, if you can repair the dbox to be water tight in place that's fine, but I worry its a wasted effort ad if it's crumbling the original concrete mix may have been bad - if so the box will continue to crumble - replacement may be in order and not too costly. Certainly you don't want to pour a new "lid" in place that seals the D-box making it impossible to open, inspect, adjust, in the future.

Question: standing water over the [septic tank?] cleanout covers


our cleanout access covers get about an inch of water on it when we run the washer and shower in the house. The water comes up quickly on just the cover and then two minutes later it's gone. We have the tank cleaned once to twice a year; we call the company that cleaned it and the are telling us they need to dig up the D box. I have checked the yard and there is standing water anywhere. Does digging up the D box sound correct. Or should they just check for a clog? - John 6/26/12


John if the septic tank or dbox is flooding as you describe it sounds as if the fields are clogged or flooded. Your system is in trouble, needs diagnosis and repair for sure. Because it's easy and quick it's a great quick-check to look into the D-box to see what's going on.

Open the D-box covers, flush a few toilets in the home, or run the washer, and watch in the D-box. If you see effluent entering and flooding the box then we figure the outlet lines and drainfield are either blocked or saturated.

Start a more throughout inspection at the septic tank, include piping to the D-box, the D-box, and the fields. For example if the tank inspection shows us that the tank baffles are gone, we know we've been pushing solids into and ruining the fields.


Continue reading at SEPTIC D-BOX TEMPORARY REPAIR or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Suggested citation for this web page

SEPTIC D-BOX COVERS at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia


Frequently Asked Questions (FAQs)

Click to Show or Hide FAQs

Ask a Question or Search InspectApedia

Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.

Search the InspectApedia website

Comment Box is loading comments...

Technical Reviewers & References

Click to Show or Hide Citations & References

Publisher's Google+ Page by Daniel Friedman