Regional Septic Information
New Hampshire can be divided into several geographic regions where septic systems are commonly used in residential areas. Each region has distinct characteristics including terrain, soil conditions, and local housing patterns that can influence septic system performance and maintenance needs.
Browse by region to find county-specific information about septic systems, towns covered, and common septic situations in different parts of the state.
Browse by Region
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Southern New Hampshire
Includes Hillsborough County and Merrimack County with major cities and suburban communities.
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Seacoast Region
Coastal communities including Rockingham County and Strafford County.
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Lakes Region
Lake communities including Belknap County and Carroll County near Lake Winnipesaukee.
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Upper Valley
Connecticut River Valley communities including Grafton County and Sullivan County.
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Southwest New Hampshire
Southwestern communities including Cheshire County and surrounding areas.
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North Country
Northern New Hampshire including Coös County and White Mountains communities.
All New Hampshire Counties
For detailed information about specific counties, including towns covered and local septic conditions, visit individual county pages:
Service Information
For information about specific septic services such as pumping, inspection, or repair, visit the septic services pages.