Home › Coverage › New Hampshire
Backflow Testing in New Hampshire
Backflow Testing across New Hampshire: the 178 ZIP codes and 151 cities we route calls in, and who licenses plumbers in the state.
Free to homeowners in New Hampshire — the contractor pays us for the introduction, you never do.
Who has to test
Our backflow testing coverage in New Hampshire runs to 178 ZIP codes in 151 cities. Where the covered places are many and small, the testing duty is set by whichever water utility serves the connection, so two houses a mile apart can sit under different rules and different annual deadlines.
Source: coverage area as published by our call partner; place and county names from the US Census Bureau.
We route backflow testing calls in 178 ZIP codes across 151 New Hampshire cities, in 8 counties.
What this site is
CrossConnect is a referral service, not a contractor. We connect property owners and managers with independent contractors. Backflow assembly testing is normally restricted to testers holding a specific certification and using calibrated equipment, and the report usually has to reach your water purveyor — ask to see the certification and ask who files the report. We carry out no testing, we certify nobody, we do not set prices, and we never charge callers anything. Nothing here selects a device for any installation or states that any assembly is passing.Checking a credential in New Hampshire
The authority is the New Hampshire Office of Professional Licensure and Certification, Mechanical Safety and Licensing Board. New Hampshire licenses plumbers but publishes no online licensee search, so verification means contacting the office directly.
Every New Hampshire county we cover
- Belknap County 17 ZIP codes
Tilton, Laconia, Alton, Alton Bay, Barnstead, Belmont, Center Barnstead, Center Harbor, Gilford, Gilmanton, Gilmanton Iron Works, Meredith, New Hampton, Sanbornton - Carroll County 2 ZIP codes
East Wakefield, Sanbornville - Cheshire County 26 ZIP codes
Keene, Alstead, Ashuelot, Chesterfield, Drewsville, Dublin, Fitzwilliam, Gilsum, Harrisville, Hinsdale, Jaffrey, Marlborough, Marlow, Nelson and 11 more - Coos County 1 ZIP code
Bretton Woods - Hillsborough County 38 ZIP codes
Manchester, Nashua, Amherst, Antrim, Bedford, Bennington, Brookline, Francestown, Goffstown, Greenfield, Greenville, Hancock, Hillsborough, Hollis and 13 more - Merrimack County 29 ZIP codes
Concord, Andover, Bow, Bradford, Canterbury, Chichester, Contoocook, Danbury, Dunbarton, East Andover, Elkins, Epsom, Franklin, Henniker and 12 more - Rockingham County 40 ZIP codes
Portsmouth, Hampton, Atkinson, Auburn, Candia, Chester, Danville, Deerfield, Derry, East Hampstead, East Kingston, Epping, Exeter, Fremont and 22 more - Strafford County 16 ZIP codes
Rochester, Dover, Durham, Farmington, Lee, Madbury, Milton, Milton Mills, New Durham, Somersworth, Union
What that coverage looks like
The 8 counties in our New Hampshire footprint are served by many separate water suppliers, and each one decides which premises must test and how often. Rockingham County, with 40 covered ZIP codes, is the largest single block of them; Manchester alone holds 8.
How a backflow testing job goes
A backflow test is a scheduled job that ends in a document. The assembly is isolated, the differential across it is measured, the result is written down, and the report goes to whoever requires it. A failed test means a repair or a rebuild and then a re-test; it does not mean the premises closes that day.
What the call asks about backflow testing
- What kind of premises it is and what is connected to the supply — irrigation, a boiler, a fire line, a commercial kitchen.
- Who is asking for the test: a water supplier, a health department, or a landlord.
- Whether there is an existing assembly with a serial number on it, and when it was last tested.
Every New Hampshire city we route in
29 cities, ordered by the share of buildings with twenty or more units. Containment assemblies are required building by building, and that is where the buildings are. Each page carries that city’s own numbers and the ZIP codes we route there.
- Newmarket 23%
- Manchester 19%
- Nashua 18%
- Derry 16%
- Dover 15%
- Concord 14%
- Milford 14%
- Portsmouth 13%
- Exeter 13%
- Bedford 12%
- Somersworth 11%
- Keene 11%
- Salem 10%
- Hampton 10%
- Hooksett 10%
- Rochester 9%
- Seabrook 8%
- Goffstown 8%
- Merrimack 7%
- Peterborough 6%
- Laconia 6%
- Londonderry 5%
- Tilton 5%
- Meredith 4%
- Hudson 3%
- Raymond 3%
- Plaistow 3%
- Pelham 3%
- Franklin 2%
Before you call
A test is a scheduled job with a report at the end of it, not a repair. What the report has to show, and who it goes to, are on the pages above.
