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Old 08-09-2020, 10:32 PM   #21
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Hi! I'm trying to find out if I can dump my tanks at home, not using the main sewer clean out, which is on the other side of my house.

I vaguely remember someone mentioning that the access point on the outside of the house could be used with a mascerator pump. I've attached 2 pics of what I'm talking about. It would be great if this is an option since we'll be doing a lot of boondocking. Thanks in advance for an wisdom you can provide.
Just ensure those caps are sewer related. Only reason I say this is from the pics the drywall and caps look new. Is this a new house? Did you have it built’/. I just know I bought a house some years back that had a pest control system where pesticide could be injected in the walls. Just make sure they are sewer related. 2” seems small and the other one?
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Old 08-09-2020, 10:41 PM   #22
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Did I miss where the OP said he is on a septic tank? Most modern houses have a 3 or 4" cleanout between the house and the street. I would expect one even on a house that runs to a septic tank. If you know where the line is, it isn't too difficult to install a cleanout. Those kind of cleanouts have two pipes sticking up with a U shape below ground so you can run a snake either to the street (or septic tank) or back to the house. . If on a septic tank, Google "Geo Method", or use a biotic to treat your black tank. That siad, post 20 has a good point. Your sink will have a vent pipe going up to the roof. If you send pressurized sewage into the line, it may go up into the vent. Over time, that sewage may dry out in the vent pipe and eventually block it. I'm fortunate, I live on a private road with a manhole right in the middle of the cup-de-sac. I just tip the top and dump right in.
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Old 08-10-2020, 10:05 AM   #23
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Thumbs up All boats with holding tanks have macerators

Our boater home (Bayliner Cierra 2550) has a macerator and they liquefy the waste and so it can go through a 3/4 pipe size discharge. I dump the boat and camp trailer into our septic tank that I drive by to park them both.
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Old 08-10-2020, 10:18 AM   #24
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We have dump port in our driveway, but it's beyond the clean-outs. The only thing between it and city sewer is the blow-back prevention valve.
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Old 08-10-2020, 11:10 AM   #25
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Even 80 gallons should be okay into a 1500 gallon tank using a macerator like he is wanting to do.
Gotcha. Makes sense. 80 gallons is not much in a 1500 gal tank. And it is already liquified, not uh.....freshly flushed. I like to keep tabs on these things because we will likely be moving to a place that will have septic. Not sure what type since we have yet to buy the land. Hoping to keep dumping at home.

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However, I would be concerned pumping mascerated poo and toilet paper through a 1 1/2 inch sink drain. If that sink drain were to plug while you are pumping waste there is no place for the waste to go but out into your master bath sinks!
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Old 08-10-2020, 02:32 PM   #26
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Maybe the septic tech thinks 80 gallons of waste water (black plus gray) will overfill the first tank? I dont know those systems, but maybe.
These systems actually have a pump to move the waste water to the top of the mound. It can only get full if the pump breaks down, and then the system stops and an alarm goes off. I never want to hear that alarm!!!
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Old 08-10-2020, 04:19 PM   #27
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Dumping in a septic system

Just a word of warning. Most chemicals sold for RV black water tanks can destroy the bacteria utilized in a septic system. Check before you dump!
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Old 08-10-2020, 05:13 PM   #28
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Just a word of warning. Most chemicals sold for RV black water tanks can destroy the bacteria utilized in a septic system. Check before you dump!
Except for the ones sold that say "Septic Tank Safe".

This is one of my favorite tank chemicals and I don't have a septic tank anymore. Don't have any tank smell either.



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Odorlos breaks down waste and tissue, lubricates valves, and speeds up the natural composting process by preventing hydrogen sulfide gases. Safe for chemically sensitive people, any septic tank system, plastic or porcelain toilets, and all holding tank systems. Formaldehyde-free.
Many campgrounds have signs up prohibiting use of Formaldehyde containing tank chemicals as they are on septic systems.

I quit using those chemicals years ago. I didn't want to preserve anything in the black tank
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Old 08-13-2020, 06:50 PM   #29
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We ran the macerator hose directly into a toilet (via the bathroom window) before we put in a dump port between the house and septic tank.
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Old 08-13-2020, 07:09 PM   #30
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Don't have a dog in this fight, but here is something else to think about, when you use your septic tank for dumping. The septic system setup, for most homes, uses a large capacity tank to receive all the waste from your home. When you use it, you are typically flushing a toilet or running dish and clothes washers. The tank is usually filled to capacity and the liquids in the tank, after the main baffle, flow slowly, into your septic field. Think of it as "overflowing the main tank" and letting the liquid run out. If you dump your camper/coach septic system, including the grey water, you are introducing up to 100 gallons of fluid into the septic tank at one time. Septic people I've talked to say this has the potential to carry solids down your drain field as the tank can't handle this sudden capacity. If you've done this for years, I guess it will work, but I don't want the issue of a major septic field failure due to a clogged up drain field. I have lived in my current home, with a "gravity septic," for over 30 years and have had trailers, fifth wheels, and motorhomes since 1986. I don't use the septic tank system for my dumping. My system is a "gravity" system, not a mound or "pressure system..." I can't speak for those type that use pumps to force fluids down the field. Maybe using a "macerator" introduces the fluids slowly enough, but I don't have that system. Just to be clear.... I'm not talking about a "pressure system." My experience is on a "gravity system" and there no pumps in my system...
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Old 08-13-2020, 07:26 PM   #31
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When we bought our house, I made sure to work with a plumber to identify cleanouts and location of vents, even went so far as to locate the sewer line in the yard so I knew where it ALL was. We had the plumber install a cleanout about 2 feet from the edge of the driveway at ground level so I could use it to dump/flush tanks. It was worth it!
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Old 08-13-2020, 08:04 PM   #32
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I have public utilities. Dumped one time by tapping into a clean out, it was too much for the grinder pump to handle.. It pushed the pump off its seat—crappy mess. If I do it again I’ll empty tanks slower. Also could be public utilities violation. As the sewage bill is based on water consumption. Just saying!
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Old 08-13-2020, 08:31 PM   #33
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Not sure of the need. Is it just to be able to flush it out really good?
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Old 08-13-2020, 08:56 PM   #34
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If that is a clean out, then you sure can! Maybe a code thing, but they are all 4” around here. Never seen a 2” clean out.

Mine is 2" at the kitchen. House built in 1973.
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Old 08-13-2020, 09:06 PM   #35
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You have a simple question.

Simple answer... yes you can. It is an option. I'd flush with water, check both bathroom tubs in the house for backup, then monitor while dumping. If you lavatories and tubs are draining well, lines are probably clear. If you have squirrels in the area, they often use your vent pipe for storage and plug up everything.

1 1/2 inch cleanout is not unusual for an older home. New ones use 2" for bath/kitchen.
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Old 08-13-2020, 09:16 PM   #36
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I have public utilities. Dumped one time by tapping into a clean out, it was too much for the grinder pump to handle.. It pushed the pump off its seat—crappy mess. If I do it again I’ll empty tanks slower. Also could be public utilities violation. As the sewage bill is based on water consumption. Just saying!

A word of caution concerning public utilities. If you get caught doing this in a public utility you may well be fined. It has happened in my community. Rationale was that the city had to treat this sewage and not getting paid for it.
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Old 08-13-2020, 10:52 PM   #37
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A word of caution concerning public utilities. If you get caught doing this in a public utility you may well be fined. It has happened in my community. Rationale was that the city had to treat this sewage and not getting paid for it.
Intersting. My city does not meter the sewage and if they did I suppose you paid for it. They predict it using your average winter water useage...my poo does not come from my water usage so they are making some assumptions about volume. I see no difference on if I shower and poo in the trailer and take it home or if I shower and poo at home and flush it. Either way the volume is the same....maybe less in the trailer because I take shorter showers.

I get charged sewer for when I water my lawn early and late in the season (they think winter is longer than I do) and filling my trailer with water. To me thats a trade in their favor as I put more water on the lawn than I can fit in my tanks.

How did they detect it and then determine a fine when it happened in your community?
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Old 08-13-2020, 11:02 PM   #38
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One neighbor gets mad at another and snitches, or coincidence.

If not at a legitimate clean-out location, might just charge for a sewer tap?
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Old 08-13-2020, 11:11 PM   #39
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Intersting. My city does not meter the sewage and if they did I suppose you paid for it. They predict it using your average winter water useage...my poo does not come from my water usage so they are making some assumptions about volume. I see no difference on if I shower and poo in the trailer and take it home or if I shower and poo at home and flush it. Either way the volume is the same....maybe less in the trailer because I take shorter showers.

I get charged sewer for when I water my lawn early and late in the season (they think winter is longer than I do) and filling my trailer with water. To me thats a trade in their favor as I put more water on the lawn than I can fit in my tanks.

How did they detect it and then determine a fine when it happened in your community?
When I read that, I assumed that it was an overzealous neighborhood association.
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Old 08-13-2020, 11:27 PM   #40
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I currently have a 3/4" x 1" adapter off my mascerator pump, with 1" jumper hose to a 1" PVC hard line all the way to my 3" kitchen clean out. Its about a 50' run. Been doing this for well over a year, never once a problem. As long as you use chemicals and only the RV paper, that mascerator will destroy anything in its path and send it on its way.

I wouldn't worry about clogging up your cleanout. A clog would never get passed the 3/4" 50' garden hose. If there's going to be a clog, its going to be in the mascerator, or the garden hose.
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