Backflow Base / Tester certification / New Hampshire
Backflow tester certification in New Hampshire.
NHDES does not issue tester certificates. Env-Dw 505 requires water systems to use a certified backflow prevention device inspector, defined as someone holding a NEWWA or ASSE Series 5000 certification.
Last updated .
Who certifies
NH Department of Environmental Services, Drinking Water and Groundwater Bureau (Env-Dw 505)
The state sets a minimum; a water system may ask for more.
What it takes
- Credential
- NEWWA or ASSE Series 5000 backflow tester certification.
Certificates from elsewhere
- AWWA: accepted as it is. NEWWA certification named in Env-Dw 505 (rule in effect from 11-23-24).
- ASSE 5110: accepted as it is. Rule names the ASSE Series 5000 certification program, which includes 5110.
No other state's certificate is named as valid here. Ask the program before you rely on one.
Where to get certified
- New England Water Works Association (NEWWA)Holliston, MA · course and exam · in person. Initial tester course with written and practical exams on the last day, plus recertification review courses. Classes in all six New England states, NY, NJ and PA. 508-893-7979.
- American Society of Sanitary Engineering (ASSE)Mokena, IL · exam. ASSE Series 5000 certification program.
Listed for convenience, not endorsed. Check that a course is on the state's approved list before you pay.
Free exam prep → Study questions, practice exams, device tests.
Test procedures for every assembly → The steps we recommend for the field exam.
Filing test reports
Inspector reports go on forms approved by the supplier of water. Suppliers file an annual inspection and testing report with NHDES.
Deadline: Supplier report to NHDES due April 1 for the prior year; devices tested at least semiannually in high hazard and annually in low hazard
Largest water systems
Manchester Water Works
- Reports
- Only a sewer backflow program was found, no cross-connection page.
Pennichuck Water Works
- Contact
- 800-553-5191 ext 2321
- Reports
- Contact Engineering to request a copy of the cross connection program; filing steps not on page.
Concord Water Department
Portsmouth Water Works
Keene Water Department
Sources
- NH Env-Dw 500 (Env-Dw 505 Cross Connections)
- NHDES Cross-Connection Control Programs
- NEWWA program information
Checked 2026-10-19 against each state's own program pages and rules. Rules change; confirm with the program before you book an exam or a test. Spot something out of date? hello@backflowbase.com.
The software
- Bookings from a booking page, your own website, and an AI receptionist on your phone.
- Schedule board and route for each tester.
- Field app that scores every test, even with no signal.
- Test reports sent to the water system that serves each address.
- Card payments to your own Stripe account, and yearly renewals that charge after the test.
- Client portal for HOAs, property managers and contractors.
- $50/month flat: no per-test fee, no cut of payments.
- Every feature →What the app does, part by part.
- Compare →Next to other backflow and field-service software.
- Start free →No card. $50/month or $500/year once you go live, 45 days free.
- Free exam prep →Study questions, practice exams, device tests, a VR wet lab.