Calling all septic tank experts!

Oct 19, 2000
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I purchased my first home last September. I've only just recently started with lawn care, and since I've started cutting this spring, I've noticed a large patch of grass in the backyard that is a much different shade of green than the surrounding grass. It's about a 3'x6' oval-type shape, just to give you a visual. About 2' up towards the house is the blue inspection pipe sticking up out of the ground, so this is roughly the area that the septic tank sits.

Just this morning while cutting the grass, I noticed that although the rest of the backyard had basically dried of morning dew in the sun, that patch of oddly colored green grass was still wet and mushy. There is no standing water, though, just soft earth that is very, very moist. It hasn't rained for a few days, with sunny mid-70 temperatures since Saturday, so weather isn't an issue. I called the wife to check it about an hour ago, and it's still wet and mushy in that area, so it's definitely not going away (not that I expected to).

There is no hint of smell in the backyard that the wife or I have noticed ever. My wife seems to have an acute sense of smell, so if there was an odor, she'd smell it. She's on the back porch all the time, a mere 10 feet from the grass in question. I have yet to actually put my nose to within an inch of the grass to try and detect any smell, but will do that tomorrow. Also, I've taken the cap off the inspection pipe, and while the water level that I can see comes up to around a few inches below the ground, it doesn't appear to be at any different of a level when I first looked while purchasing the home. I'm thinking that septic tanks function at an always full level anyway, but someone correct me if I'm wrong on this.

Here's what I know of the septic tank history. We purchased the house last September, and only 2 of us live there. I do not know the size of the septic tank. The house was empty approximately a year before we moved in. When we purchased the house, the previous owner told me it had been "a couple of years" since the tank had been pumped. The washing machine water does not interface with the normal house wastewater collection, so that takes even more load off the tank.

So, what am I looking at here? Normally, I would probably pony up the $140 to have the tank pumped, but here's the exception to the whole thing. My subdivision is currently being upgraded with sewer lines. They already have dug up the roads and laid the line, but the entire thing isn't expected to be completed until around this time next year when we'll have it hooked up to the house.

From a couple of family members I've spoke to, they've said the wetness is normal with any septic system, and not to worry about it. I don't trust them, though, so I've come to the all-knowing ATOT. I absolutely do not want a septic pool in my too-small backyard. Does it sound like I currently have a problem? If so, will getting the tank pumped most likely solve any potential problems until I leave the whole septic tank behind next year when we switch to sewer? Or am worried about nothing? I don't mind spending the money to have it pumped if need-be, but I don't want to jump the gun and there not really be a need to spend the money.
 

SampSon

Diamond Member
Jan 3, 2006
7,160
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That patch of grass is where the leech field expells the water from the septic system. It's common.
You may want to pump the tank anyway because it's been a few years. It's cheap and it's good maintenence.
 

KarmaPolice

Diamond Member
Jun 24, 2004
3,066
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out of all the things i yearn to be a expert in, I would have to say that septic tanks are pretty low on the list...
 

Analog

Lifer
Jan 7, 2002
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Is the ground around the septic field level? Our field is raised above the plane of the surrounding area, as is our whole house, and we don't have this issue. According to the septic installers, "you can't pump a septic tank enough", meaning pump it to keep it maintained. But if you don't want to pony up, then ask your neighbors, as the soil conditions and general terrain is local. Around here, a wet area is of some concern, but it may not be where you are.
 

IGBT

Lifer
Jul 16, 2001
17,976
141
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..I've helped install them and have a sep.tank in another home. None of the tanks I've installed or my tank show any sign of mushy or damp soil above or around the tank. We installed 50' of leach field drain pipe and installed the pipe in aprox.5' graveled trench. It's possible your leach field pipe may be leaking at the tank thus the damp area above/around the tank. If the tank is legal and by code it's particulars will be known i.e. how long the leach field is so you can do a little digging and inspect. If it's boot leg anything goes. One shure fire way to kill a septic tank is to allow chlorinated products to enter the tank. That will kill off the biological activity necessary for the tank to work. I've seen people use chlorinated toilet cleaners in a septic system and kill the tank. A healthy tank doesn't need to be pumped out very often. It's been 10 years since I had my tank last pumped.
 

Kalvin00

Lifer
Jan 11, 2003
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Originally posted by: IGBT
A healthy tank doesn't need to be pumped out very often. It's been 10 years since I had my tank last pumped.

Guess ours is doing alright then. The house has been here for 18 years and never needed the tank pumped...with an average of 4 people living here..
 

IGBT

Lifer
Jul 16, 2001
17,976
141
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Originally posted by: Kalvin00
Originally posted by: IGBT
A healthy tank doesn't need to be pumped out very often. It's been 10 years since I had my tank last pumped.

Guess ours is doing alright then. The house has been here for 18 years and never needed the tank pumped...with an average of 4 people living here..

..ya. just keep the chlornated products and solids that won't break down. I hear the worst offender are cig.butts. The things resist any decomposing. I use a product called Septonic. Little packets of bug food. Works great.

 
Oct 19, 2000
17,860
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To igbt, if the leech pipe is actually leaking, is that something that I would even need to concern myself with since I'll be switching to sewer next year?

From the replies here and what I've been told by family members, it sounds like there is nothing to worry about on my end. It's just that this is my first spring here, so I'm really noticing everything for the first time being outdoors a lot.

Thanks a lot for the answers.
 

AlienCraft

Lifer
Nov 23, 2002
10,539
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#1. That leech field may not be far enough below the surface, or improperly covered. Your County Building dept can advise as to local code requirements.
#2. A properly sized and environmentally active septic system should not require pumping. This should have been addressed in the initial design. What is acceptable as far as code is concerned may not be optimal as far as real use is concerned.
 

IGBT

Lifer
Jul 16, 2001
17,976
141
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Originally posted by: blurredvision
To igbt, if the leech pipe is actually leaking, is that something that I would even need to concern myself with since I'll be switching to sewer next year?

From the replies here and what I've been told by family members, it sounds like there is nothing to worry about on my end. It's just that this is my first spring here, so I'm really noticing everything for the first time being outdoors a lot.

Thanks a lot for the answers.

..if your connecting to municipal sewer syst. the dampness will eventually dry up because your no longer emptying to the tank. Once the tank is abandoned I would take measures to fill it in so it doesn't become a cave in hazard years later.

 

skyking

Lifer
Nov 21, 2001
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Take the cap off the cleanout. shine a flashlight in there. Note the depth of the pipe below the ground. Look for standing water in the pipe.
Now that you know the depth of the pipe, you can figure out how deep the tank is. Dig up the inlet baffle cleanout on the end of the tank nearest the house.
Open up the tank there, look inside to see that the baffle is intact. It is usually a concrete tank and the inlet baffle is a concrete piece that segregates the inlet from the main part of the tank. It is crucial for proper function, and it will fall off of older tanks from time to time.
Have somebody run some water in the house, flush a tiolet with some paper or something. Watch that pass into the inlet of the tank. If it flows right in, then the piping on the inlet side is probably intact, and does not warrant further inspection. Sometimes wet areas like the one you describe are due to disconnected inlet piping, with the water leaking on the upstream side of the tank.