Septic pumping in Coos County, New Hampshire costs $350-$700 (avg $500). A new septic system installation costs $7,150-$14,350. Approximately 7,504 homes in this county use septic systems.
Septic System Costs in Coos County
| Service | Low | Average | High |
|---|---|---|---|
| Pumping / Cleaning | $350 | $500 | $700 |
| Routine Inspection | $300 | $400 | $550 |
| Real Estate Inspection | $500 | $700 | $1000 |
| Minor Repair | $900 | $1,300 | $6,300 |
| Conventional Installation | $7,150 | $10,250 | $14,350 |
| Aerobic System Installation | $13,450 | $19,200 | $26,900 |
| Drainfield Replacement | $7,150 | $10,250 | $14,350 |
| Perc Test | $1,100 | $1,550 | $2,150 |
Cost estimates based on regional market data for Coos County, New Hampshire. Actual costs depend on system type, site conditions, and provider.
Groundwater & Water Table in Coos County
Monitoring Wells
5
Avg Depth to Water
7.2 ft
Median Depth
6.7 ft
Shallowest Recorded
0.6 ft Shallow Risk
Moderate water table depth. Some sites may require modified systems or mound systems.
Source: USGS National Water Information System. Based on 179 measurements from monitoring wells.
Septic Regulations & Permits in Coos County
State Regulatory Body
New Hampshire Department of Health/Environment
Inspection Required for Home Sale
No / Varies
Nitrogen Reduction Areas
No
Advanced Treatment Required
No
Contact county health department for specific requirements.
Contact the Coos County health department for current permit requirements, fees, and approved system types.
Septic System FAQ for Coos County
How much does septic pumping cost in Coos County?
Septic pumping in Coos County, New Hampshire typically costs between $350 and $700, with an average of $500. Costs vary by tank size (1,000-1,500 gallons is typical), ease of access, distance from the pumping company, and how full the tank is. Most homeowners should pump their tank every 3-5 years.
How much does a new septic system cost in Coos County?
A conventional septic system installation in Coos County typically costs $7,150-$14,350. An aerobic treatment unit (ATU) costs $13,450-$26,900. Costs include the tank, drainfield, permits, and labor.
Do I need a permit for a septic system in Coos County?
Yes. Virtually all counties in New Hampshire require a permit before installing, repairing, or replacing a septic system. The permit process typically involves a soil evaluation or percolation test, system design by a licensed professional, application to the county health department, and one or more inspections during installation. Contact the Coos County health department for current requirements and fees.
What soil types are in Coos County and how do they affect septic systems?
Contact the county health department for soil evaluation requirements.
How often should I pump my septic tank in Coos County?
The EPA recommends pumping your septic tank every 3-5 years for a typical household. The exact frequency depends on tank size, household size, and water usage. A 1,000-gallon tank serving a family of 4 should generally be pumped every 3 years. With approximately 7,504 septic systems in Coos County, there are many local providers offering regular pumping services.
Does the water table in Coos County affect septic systems?
Yes. The average groundwater depth in Coos County is approximately 7.2 feet, based on USGS monitoring data from 5 wells. While this is sufficient for many conventional systems, sites with lower elevations or seasonal water table fluctuations may require alternative system designs. A site-specific evaluation is always recommended.
How long does a septic system last in Coos County?
A well-maintained septic system in Coos County typically lasts 25-30 years, though some components may need attention sooner. The concrete septic tank itself can last 40+ years, while the drainfield — the most critical and expensive component — usually lasts 15-25 years depending on soil conditions. Regular pumping every 3-5 years and avoiding excess water usage are the two most effective ways to extend system life.
Data last updated: 2026-04-13