State guide
New Hampshire
New Hampshire is the clearest of the three states on statewide default responsibility: an administrative rule says that, unless a public water system has formal rules to the contrary, the utility is responsible from the main to the curb stop and the customer is responsible from the curb stop to the premises. NHDES also publishes lead-service-line inventory guidance, customer materials, and funding guidance for full replacement of lead and galvanized-requiring-replacement lines.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- Who usually owns the water service line
- Yes—New Hampshire's default statewide rule is that the public water system is responsible from the water main to the curb stop, and the customer is responsible from the curb stop to the premises, unless the system has adopted formal rules to the contrary.
- State drinking water program
- New Hampshire Department of Environmental Services, Drinking Water and Groundwater Bureau
- State lead service line page
- Official page →
- Permits for repair or replacement
- No statewide private-side repair permit rule was found on the reviewed NHDES or rules pages; local excavation or plumbing permits may apply, and Dover states no work on a water service line up to and including the meter is permitted except under its rules.
- Assistance programs
- NHDES says Drinking Water State Revolving Fund lead service line replacement funding is available for full replacements, and city programs found include Concord free water testing and possible financing solutions plus Manchester's service-line protection plan.
Official resources in New Hampshire
Official state rule setting the default split at the curb stop unless the public water system has contrary formal rules.
Official NHDES lead service line inventory guidance for utilities and service-line ownership examples.
Official NHDES lead replacement FAQ covering inventories, replacement plans, and customer-owned portions.
Official city page explaining ownership at the curb stop/property line and current line-inventory work.
Official city page for private-side identification help, free water tests, and potential financing solutions.
Key facts for New Hampshire
- New Hampshire rule Env-Dw 504.07 says that unless a PWS has formal rules otherwise, the owner is responsible from the main to the curb stop.
- The same rule says the service customer is responsible from the curb stop to the customer's premises.
- NHDES guidance says the service line ownership is split at the curb stop.
- NHDES says a replacement plan is required if a system has any lead, galvanized requiring replacement, or unknown service lines in its inventory.
- NHDES says the water system must offer to replace the customer-owned portion if it is lead or galvanized requiring replacement, but is not required to front the cost.
- Dover says on publicly owned streets the city owns and maintains the main, curb stop, and service line to the property line.
Utility water service line rules in New Hampshire
| Utility | city | phone | Details |
|---|---|---|---|
| NHDES Drinking Water and Groundwater Bureau Merrimack | Concord | Not published* | State bureau contact for lead and copper rule questions and drinking-water oversight. |
| NHDES DWLead contact Merrimack | Concord | Not published* | Lead-service-line inventory guidance contact shown on NHDES identification materials. |
| Manchester Water Works Hillsborough | Manchester | (603) 624-6494 | Water utility contact page with service-line inventory and service-line protection plan links. |
| Manchester Water Works Service Line Protection Plan Hillsborough | Manchester | Not published* | Utility page stating the plan covers the water service line from the property line into the home. |
| City of Concord Water Service Lines Merrimack | Concord | 603-228-2737 | Official line-inventory page offering help identifying service material, free water tests, and possible financing solutions. |
| City of Dover Community Services Department Strafford | Dover | Not published* | Official water-service-line contact for inspections, material confirmation, and water-system questions. |
| City of Dover Community Services Department - Water Division Strafford | Dover | Not published* | Official notice page for unknown water service line material and homeowner follow-up. |
* Not published: the official page doesn't list it. Call the office to confirm before you rely on it.
What to do next
- In New Hampshire, start with the curb stop rule, then check whether your specific water system has adopted different formal rules.
- Ask your utility whether your property appears in the state or city service-line inventory as lead, galvanized requiring replacement, or unknown.
- If your private-side line may contain lead or galvanized pipe, ask the utility about free inspection or water-testing help and whether financing or state revolving-fund-backed replacement options are available.
Not seeing your utility or county?
We list a utility only when an official government page publishes its rules. If yours isn't in the table above, it may not publish them online yet. Here's what to use instead, in order:
- General Start with the statewide information above. It applies across New Hampshire, but cities and counties can add their own steps, fees or deadlines.
- Closest verified Nearest places where we have verified local data outside this state (distance from New Hampshire's population center, for comparison only):
- Medford Water Quality Division Lead and Copper Program, Massachusetts · about 57 miles
- Cambridge Water Department, Massachusetts · about 60 miles
- MassDEP Drinking Water Program, Massachusetts · about 64 miles
- Call to confirm Ask the official office. They have the current local rule, fee and form.N.H. administrative rule Env-Dw 504.07
Website →Phone not shown: use the contact page on the official website above.Your city or county office: Local governments →Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the New Hampshire page on USA.gov can point you to the right office. - Know the current info? Tell us and include a link to the official page. We check every tip before it goes up.
Helpful guides
- Who is responsible for the water line to your house?
- The curb stop, meter and property line, explained
- Water line leak in your yard: what to do
- Water service line replacement costs
Water line responsibility check →