Do aerobic systems need to be pumped?

Yes. The pretreatment tank and sometimes other chambers still collect solids and need periodic pumping, usually less often than a conventional tank.

What chlorine does an aerobic system use?

Most use chlorine tablets made for wastewater treatment, not pool tablets. Ask your service company which product your unit requires.

Is a service contract required?

In many areas, yes, especially after the first years. Check with the Hillsborough County health department to see what applies in Merrimack.

Can a regular septic company service my aerobic unit?

Many can, but not all. Ask whether the company works on aerobic systems and on your brand.

Aerobic System Maintenance for Merrimack Homes

If your home in Merrimack has an aerobic septic system, it depends on an aerator, controls and often a disinfection step to work correctly. When any of those fail, the system can smell, alarm or discharge poorly treated water.

Request a call and a local company that knows aerobic units can inspect and service yours.

Inside an aerobic treatment unit

Most units have three stages: pretreatment, aeration and clarification, followed by disinfection and dispersal. The aerator runs much of the day, and an alarm warns of high water or equipment failure. Each part has to work for the system to treat water properly.

Items checked on every aerobic service call

A good service call covers the compressor and its filter, the air diffusers, every float and the alarm, the control panel and timer, the spray heads or drip lines, and the chlorine or UV unit. Many contracts in Hillsborough County also include the inspection report some counties require, so ask whether filing it is part of the visit.

When your aerobic alarm goes off

First check the breaker for the system. If it has tripped and trips again after resetting, do not keep resetting it. Cut back on water use and schedule service. Tell the company the brand of your unit if you can find it, since parts differ between manufacturers.

A service schedule for aerobic units

Aerobic units are not set and forget systems. Many permits and maintenance contracts call for a visit every four to six months, plus pumping of the pretreatment tank every few years. Households that run a lot of laundry or have many people may need visits more often to keep the unit treating water properly.

Signs your aerobic system needs attention

Watch for a sewage or rotten egg smell, an aerator that is silent, cloudy or foul-smelling discharge, spray heads that do not run, and alarms. Soggy areas near the spray field can also point to a problem.

What to ask before signing a service contract

Before you sign, ask how many visits a year are included, whether parts and chlorine are covered, and how fast they respond to an alarm. Ask if they file any inspection reports your county requires on your behalf, and whether they are certified to work on your brand of aerobic unit.

Aerobic system components, from tank to yard

From the house outward, an aerobic system usually has a trash or pretreatment tank, an aeration chamber with a compressor, a clarifier, a disinfection unit and a pump tank that feeds spray heads or drip lines. A control panel ties it together and sounds the alarm when something stops working.

When to call right away

Call soon if the alarm sounds and does not stop after you check the breaker, or if the aerator is silent. A strong odor near the unit or the spray field is another reason to call. Treated water that looks gray or smells like sewage is a sign something needs attention in your Merrimack system.

Aerobic system service around Merrimack

Aerobic units near Merrimack run on electricity, air and bacteria, so they need more attention than a standard tank. A service visit checks the aerator, the timer, the alarm and the disinfection stage. Many counties, including Hillsborough County, expect a maintenance contract to stay in place. Keep the service reports in one folder, because inspectors often ask to see them.

Why Merrimack conditions matter for aerobic systems

Most mapped soils near Merrimack are rated very limited for septic absorption, which is one reason aerobic units are used here. The cleaner water they produce is easier on difficult soil, as long as the unit is serviced. About 46 inches of precipitation a year can overload spray fields and let water into tanks, so keep an eye on alarms after storms. About 3 months below freezing make a sheltered, working aerator important, since treatment slows when the unit gets too cold.

Local conditions in Merrimack that affect aerobic septic service

Among the mapped soils within about two miles of central Merrimack, the USDA soil survey rates 100% as very limited for septic absorption fields, 0% as somewhat limited and 0% as not limited. The most common drainage class is well drained. Soils like these often call for careful system design, such as a larger drain field, a mound or another engineered system, and a site evaluation before any new installation or replacement.

Merrimack averages about 46 inches of precipitation a year, and October is usually the wettest month. Average temperatures stay below freezing for about 3 months a year, with January averaging 23°F, so tank lids and shallow lines benefit from a layer of snow or mulch rather than being cleared bare.

Sources: USDA NRCS Soil Survey (SSURGO), Soil Data Access; NASA POWER long-term climatology. Soil ratings describe mapped soil types near the city center and do not replace a site evaluation of your property.

What the soil around Merrimack means for aerobic septic service

By drainage class, the USDA soil survey maps the land around Merrimack as 31% well drained, 21% moderately well drained, 16% excessively drained, 16% poorly drained, 13% very poorly drained, 3% somewhat excessively drained. Aerobic systems are often used where soil is too limited for a conventional field; around Merrimack, 100% of the soil is rated very limited.

Source: USDA NRCS Soil Survey (SSURGO), Soil Data Access

Septic companies near Merrimack

These are the septic companies in our directory closest to Merrimack, with straight-line distance. Call any of them directly, or send one request and we will pass it to the best match.

Souhegan Septic Tank Service LLC, Amherst, NH, 3.7 mi
Hamm Septic Service Inc, Hudson, NH, 5.8 mi
Rci Septic Service, Londonderry, NH, 6.3 mi
B & D Septic Service, Nashua, NH, 6.9 mi
Maznek Septic Service, Bedford, NH, 7.0 mi
Zahn K M & Sons Inc, Milford, NH, 7.6 mi

Aerobic Septic Service in nearby towns

We also cover aerobic septic service in these towns near Merrimack:

Litchfield, 2.6 mi
Amherst, 4.4 mi
Bedford, 5.8 mi
Londonderry, 6.7 mi
Nashua, 7.3 mi
Hollis, 7.8 mi

About Merrimack, NH

Merrimack is in Hillsborough County, New Hampshire. About 28,916 people live there, across 32.6 square miles of land (about 887 per square mile).

Aerobic Septic Service questions in Merrimack

Do aerobic systems need to be pumped?: Yes. The pretreatment tank and sometimes other chambers still collect solids and need periodic pumping, usually less often than a conventional tank.
What chlorine does an aerobic system use?: Most use chlorine tablets made for wastewater treatment, not pool tablets. Ask your service company which product your unit requires.
Is a service contract required?: In many areas, yes, especially after the first years. Check with the Hillsborough County health department to see what applies in Merrimack.
Can a regular septic company service my aerobic unit?: Many can, but not all. Ask whether the company works on aerobic systems and on your brand.