You’ve got a camp on a Penobscot County lake, a composting toilet or a privy out back, and a kitchen sink that drains into a pipe somebody ran into the woods in 1974. That pipe is a grey water system of a sort, and in Maine it is almost certainly not a legal one. Here’s how grey water is really handled in Maine, what a proper grey water system looks like, and what to do if your camp has the old pipe-to-the-trees setup.
If you’d like someone to look at what you have now, you can book a pump-out or inspection or call (207) 300-9238 and describe the setup.
What grey water is, and what it is not
Grey water is the used water from sinks, showers, tubs and the washing machine. It does not include anything from a toilet. Toilet waste is called black water, and it carries the heaviest load of bacteria and solids.
That split sounds like grey water must be nearly clean. It isn’t. Kitchen sink water carries grease, food scraps and detergent. Laundry water carries lint and fibres, plus soap and sometimes bleach. Shower water carries skin oils, hair and soap, and all of it carries bacteria. A sink that rinsed a raw chicken pan is not a harmless stream.
So the idea that you can send grey water “straight to the ground because it’s just soapy water” doesn’t hold up in the rules or in the soil. The water that leaves your camp still has to be treated before it reaches groundwater, a well, a brook or the lake.
Why you can’t just pipe it onto the ground in Maine
The short version: Maine regulates wastewater from a building, not just toilet waste. The Maine Subsurface Wastewater Disposal Rules (10-144 CMR 241) cover wastewater disposal systems, and a straight pipe, a ditch, or a barrel sump with no design is not one of them. Our post on the Maine subsurface wastewater rules explains who files what and who inspects it.
There are practical reasons behind the rule too. Grey water is wet, it is warm, and it carries food for bacteria. Poured on bare soil, it ponds in spring, smells in July and freezes in a sheet in January. On a lake lot the water often has a short trip through thin soil before it hits the shoreline. That’s why shoreland zoning gets stricter near water, and why a “temporary” pipe tends to become a problem for the next owner.
If you’re buying a camp and you see a plastic pipe sticking out of the foundation with nothing at the end of it, treat that as a red flag and ask the local plumbing inspector (LPI) what is on file.
What a permitted grey water system can look like
A grey water system in Maine is a real option for some camps, especially ones with a composting toilet or a privy and no flush toilets. The design usually has three parts: a way to catch grease and solids, a place to spread the water out, and soil that can finish the treatment.
How much of that you need depends on how water reaches the camp. The state rules sort it roughly like this:
- Hand-carried or hand-pumped water: a “primitive” system, a small grey water field for no more than three fixtures (a bathroom sink, a shower or tub, a kitchen sink). No septic tank is required, though a filter may be.
- A storage tank or cistern of 1,000 gallons or less, or a portable pump: a “limited” system, still for no more than three fixtures, with a somewhat bigger field.
- Pressurized water, like a well pump or a pressure tank: a full grey water system, which the LPI may approve for a single-family camp or home. It needs a septic tank or an outlet filter ahead of the field.
In plain words, that tends to mean a filter or small tank, then a disposal field or bed sized for the flow. A licensed site evaluator looks at the soil, the slope, the water table and the distance to the lake or a well, and then files the design on the HHE-200 form. The LPI reviews it and issues the permit. A licensed installer builds it, and the LPI inspects before it’s covered.
We don’t do any of that design or installation work. What we do is pump, inspect and maintain what’s there, and tell you what we saw. If you want to know who can design a system for your lot, start with your town’s LPI, who can point you to the site evaluators who work in your area.
Two warnings. First, rules change over the years and every lot is different, so what a neighbour got approved ten years ago isn’t a promise for you. Second, “grey water only” doesn’t mean tiny. With pressurized water, the rules size a grey water field for at least 70 percent of the flow a full system would be designed for. The rest of the sizing depends on the soil and the lot, and that’s the site evaluator’s call, not ours.
What counts toward the size: use, soil and the lot
Nobody can hand you a finished grey water field size over the phone, because the state’s design flows are only the starting point. The drivers are easy to list, though. Here’s what the designer weighs:
| Factor | Why it matters | What to bring to the site evaluator |
|---|---|---|
| Number of people and nights | More use means more water to treat | A rough count of weekends, guests and full summers |
| Water supply and fixtures | Hand-pumped water allows only a few fixtures; a pressure pump and a washing machine mean a bigger design | How water gets to the camp, and a list of every drain |
| Soil type | Sandy soil drains fast but treats poorly. Clay holds water | Nothing, they dig a test pit |
| Water table and ledge | Shallow ground limits the options | Any known wet spots or exposed rock |
| Distance to water | Lake, brook or well setbacks apply | Where the well and shoreline sit |
| Seasonal or year-round | Year-round use needs frost protection | Your real plans for winter use |
For some lots the answer is a small field. For others, ledge, a high water table or a tight shoreland lot rules the field out, and the camp ends up with a holding tank instead. Our guide to a holding tank vs a septic system at a camp walks through that trade-off.
Grease, soap and the kitchen sink
Even the best-designed grey water field fails early if the kitchen sink is a dumping ground. Grease is the main culprit. It cools, floats and coats the tank walls, and then it travels into the field, where it seals the soil so water can’t soak in.
Here’s what keeps a camp grey water system healthy:
- Scrape plates into the trash or compost before rinsing. Do not use the sink as a food bin.
- Pour cooking grease into a can, let it set and throw it out. Never down the drain.
- Use a mesh strainer in the kitchen sink and empty it into the trash.
- Go easy on bleach and harsh cleaners. A little does less harm than a lot, and a lot of it hurts the bacteria that do the work.
- Spread laundry across the week rather than doing six loads on Saturday.
Our post on what not to put down a septic system has the longer list. Nearly everything on it applies to a grey water system, because the problem isn’t the toilet, it’s the stuff that goes down the sink.
A few camp scenarios
These are hypothetical, not real customers, but they follow patterns that are common in this part of the state.
Say you have a seasonal camp on a Penobscot County pond, built in the 1960s. The kitchen sink and shower drain through a pipe that ends in a gravel pit behind the shed. There’s a privy for the toilet. Whether a setup like that is left alone or has to be fixed is the LPI’s call, and changes to the camp can trigger a requirement to bring it up to current rules. If you plan to add a bathroom or turn the camp into a year-round home, talk to the LPI before you buy a single fixture. Our post on moving a camp to year-round use covers that.
Now say you inherit a camp outside Eddington with a small buried tank on the kitchen sink and a composting toilet. You don’t know where the tank is or when it was last cleaned. That’s a job for a pump-out and a look at the inlet and outlet. If you’re lost on where the cover sits, our guide to finding your septic tank is a decent place to start, and a pumping visit can include locating it.
Last, picture a camp lot in Levant where the owner wants to add a dishwasher and a washing machine. More water means more load on whatever the system is. Before the machines go in, ask the LPI whether the existing design can take it.
Freezing and winter
A grey water system gets less water than a full septic system, and less flow means less heat in the line. In a Maine winter that matters. A small flow in a shallow pipe, or a trap that holds standing water, freezes sooner than a busy household system.
Designs account for frost depth, and a camp that sits empty from October to May needs a proper closing so water isn’t left in traps and lines. Our camp opening and closing service page explains what we do on those visits, and the post on whether a septic system can freeze in Maine shows how it happens.
If you open the camp in spring and find a slow or dead drain, don’t dump bleach down it or run the hose into the field. Call (207) 300-9238 and describe what you see. A tank that’s full of grease is something we can check and pump. A pipe with a sag in it may need line jetting or a camera run, which is a separate job to ask about when booking. A cracked buried pipe or a failed field needs a site evaluator and an installer.
What to do if your camp has an old pipe-to-the-woods drain
Don’t panic, and don’t fix it yourself with a shovel and a length of pipe. Here’s a sensible order of operations:
- Find out what you have. Follow the pipe from the building and note where it ends. Take photos.
- Call the LPI in your town and ask what’s on file for the property. Ask what triggers an upgrade and what the options are.
- If there’s a tank, have it located and pumped, and ask what the inlet and outlet look like.
- If the LPI says it needs to change, hire a licensed site evaluator to look at the lot. They’ll tell you whether a grey water field, a small conventional system or a holding tank fits.
- Get written quotes from licensed installers. Ask what’s included in the price, who handles the permit paperwork, and what the inspection schedule is.
New and replacement systems in Maine commonly run $12,000 to $40,000 or more, and many conventional replacements land between $12,000 and $25,000. A grey water only design may cost less, or may not, depending on the lot. Don’t let anyone quote you from a distance, because the soil decides the price.
For a pump-out we charge in the usual range for the area: a routine pump-out of a 1,000 to 1,500 gallon tank with an accessible cover runs $350 to $550. A septic inspection is $200 to $500. If the cover is buried, digging is an added fee, and a riser removes that for good. If your camp’s tank is a small one, tell us when you book so we can plan for it. You can book online or read about septic tank pumping and septic inspection.
What EPA and Maine say
For plain-language background on how treatment happens in the ground, see the EPA’s page on how your septic system works. For care tips that carry over to a grey water system, the EPA has a page on caring for your septic system. Your own rules come from the state and your town, so your LPI is the person to ask about anything specific to your lot.
If you’re thinking about a composting toilet to go with a grey water system, our article on composting toilets in Maine covers camp rules and upkeep.
Frequently Asked Questions
Can I drain my camp sink and shower onto the ground in Maine?
No. Grey water from sinks, showers and laundry carries soap, grease, food and bacteria, and Maine treats it as wastewater that needs a permitted disposal system. A pipe to the woods, a ditch or the lake is a violation, and it can foul a well or a shoreline. Ask your local plumbing inspector what is allowed on your lot.
Is a grey water system the same as a septic system?
Not quite. A conventional septic system treats toilet waste and grey water together. A grey water system handles only the sinks, shower and laundry, and it is usually paired with a composting toilet or a privy. It still needs a design from a licensed site evaluator and a permit from the local plumbing inspector.
Does a grey water system need pumping?
If the design includes a tank or grease trap, yes, it needs to be checked and pumped on a schedule. Grey water tanks collect grease and solids even without toilet waste. A pumping visit can include a look at the inlet and outlet. A system with only a filter needs the filter cleaned instead.
Can a grey water system freeze in a Maine winter?
Yes, especially at a camp that sits empty. Shallow pipes, a grease trap and a small flow of water all raise the risk. Designs account for frost depth, and closing the camp properly before freezing weather helps protect the lines.