Greywater & Alternative Wastewater
Greywater diversions, holding tanks, and alternative wastewater setups where a conventional septic isn't an option.
About this service
Some sites can't take a conventional drain field — wrong soil, wrong slope, sensitive watershed, or just not enough room. We work with greywater systems, holding tanks, and other alternative wastewater approaches that keep the property compliant and functional.
Signs it's time to call
- Soil or terrain won't perc for a conventional drain field.
- Site is too small or too close to surface water.
- Cabin is used lightly and a full septic system is overkill.
- You want to reuse greywater for irrigation where it's allowed.
How we approach it
- Walk the site and review percolation, setbacks, and use patterns.
- Spec greywater diversion separate from blackwater where appropriate.
- Install holding tanks with proper venting and access for pumping.
- Coordinate permits with the local health district.
Note:Alternative systems often need a designer and health-district approval. We'll tell you straight whether your site is a candidate.
Common Questions
What is greywater?
Wastewater from sinks, showers, tubs, and laundry — anything that isn't from a toilet or kitchen disposal. It's far less contaminated than blackwater and can sometimes be diverted to irrigation or a separate disposal field.
Is greywater reuse legal in Idaho?
Idaho allows certain greywater reuse with permitting through the local health district. Rules vary by district and site — there are setbacks, subsurface-distribution requirements, and design standards. We work within them.
When does greywater separation make sense?
Sites with poor percolation, very limited drain-field area, sensitive watershed, or low water availability. Separating greywater from blackwater can shrink the blackwater system to manageable size.
What's a holding tank and when is it required?
A sealed tank that collects waste for periodic pumping — no drain field. Health districts allow them in specific circumstances (very tight sites, recreational lots, light seasonal use). Requires a regular pumping contract.
Can I water my garden with greywater?
Only with a permitted, properly designed subsurface system and certain types of greywater (no kitchen, no diapers, etc.). Surface irrigation with greywater isn't allowed in our area.
What's a mound system?
An above-grade engineered drain field used where soils are too shallow, too tight, or too close to bedrock or groundwater for a conventional field. They're a real answer for back-country lots that wouldn't otherwise perc.
Do alternative systems need a designer?
Yes — health districts require a licensed designer for alternative systems (mound, pressurized, drip, lagoon, etc.). We coordinate with designers we trust so the plan and the install line up.
How much does an alternative system cost vs. a conventional septic?
Usually more — sometimes substantially. But the comparison isn't 'alternative vs. conventional,' it's 'alternative vs. no working system.' If the lot won't take a conventional field, alternative is the only path.
Can you tell from a site visit whether my lot will work?
We can usually flag obvious problems — slope, bedrock, surface water, room for a field. The definitive answer comes from a percolation test and the health district's review. We arrange both.
How often does a holding tank need to be pumped?
Depends on tank size and use. A 1,500-gallon tank serving a weekend cabin for two might go months between pumps; a full-time family blows through that in weeks. We help you set up a realistic pumping schedule.
Need Greywater & Alternative Wastewater at your cabin?
Tell us where the property is and what's going on. We'll plan the trip and bring the right parts.