Monitoring & Treatment

Hampstead Area Water Company, Inc. (HAWC) is dedicated to providing our customers with safe drinking water; this is achieved through routine monitoring and treatment of the water supply.  


Water analyses and treatments are performed as required and directed by the United States Environmental Services Agency’s Safe Drinking Water Act (SDWA) and the New Hampshire Department of Environmental Services’s (NHDES) Drinking Water and Groundwater Bureau (DWGB).  All water tests are performed by an independent laboratory that is accredited in accordance with the  National Environmental Laboratory Accreditation Conference (NELAC) & the New Hampshire Environmental Laboratory Accreditation Program (NH ELAP).

Some of the contaminants we monitor for include:

  • Microbial contaminants from septic systems, agriculture & livestock operations, and wildlife.
  • Inorganic contaminants such as salts and metals that can naturally occur or result from storm water runoff, industrial & domestic waste water discharges, or farming.
  • Pesticides and herbicides from sources such as agriculture, storm water runoff, and residential uses
  • Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes.
  • Radioactive contaminants that can naturally occur.

To view the most recent report for your water system, visit our Water Quality Reports page.

water glassTreatment

All of HAWC’s water sources originate from bedrock wells. Water from the wells is naturally filtered and is free of almost all regulated contaminants.

Water treatment includes the use of chlorine for disinfection to ensure the water is free of harmful bacteria. Fluoride is not added to your water supply.

To view the most recent report for your water system, visit our Water Quality Reports page.





Cross Control

The NH Department of Environmental Services (DES) requires all water systems with greater than 1,000 connections to implement a Cross Connection Control Program for identifying and eliminating “cross connections” to the drinking water system.

It’s the Hampstead Area Water Company’s (HAWC) responsibility to protect the public drinking water supply from contamination that might occur through unintentional “backflow”. Backflow is the undesirable reversal of flow in a drinking water distribution system which may introduce harmful substances into the drinking water system. A backflow situation could occur if the drinking water system suddenly loses pressure. For example, if large quantities of water were being pulled from the system to fight a fire, or there was pipeline break with the loss of significant amounts of water.

Each device is required to be tested on a yearly or semi-annual basis depending on the device type and degree of hazard. All devices must be tested by a state-approved tester who is registered with the state of NH.

A list of registered state approved testers can be found at


Customers that have backflow devices installed receive an annual notice and are responsible for submitting test results to HAWC by April 1st.

In an effort to make the process as simple as possible HAWC has a certified backflow tester on staff. If you would like HAWC to make an appointment, please contact our office and schedule a backflow test. HAWC currently charges a fee to test each backflow device. Please note if the device fails the backflow test, you will be responsible for the costs of repairing and re-testing the device within 30 days of failing the test.

Please note: If your location has fire protection you will need to inform your alarm company prior to the backflow testing.

We appreciate the opportunity to serve you.  If you have any questions, please feel free to contact us at (603) 362-4299 or