Safe Drinking Water Choices for Households in Rockingham County: Understanding System Data and Treatment Options

This week, households in Exeter, Rockingham County face a key decision: which water treatment approach best ensures safe drinking water for their family. Understanding the local public water system record and what testing reveals can clarify this choice.

What do 'detected', 'median' and 'range' mean in the Exeter Water Department sampling record?

Government data for the Exeter Water Department shows various constituents measured in the public water system. The term 'detected' means that an instrument found a specific substance during sampling; it does not imply a violation or health risk on its own. 'Median' indicates the middle value of all measurements taken, and 'range' describes the spread from lowest to highest concentration recorded. These terms help interpret the variability and distribution of water quality data collected for the community's surface water source.

What does a certified laboratory test for water constituents report and how should it be read?

A laboratory test performed on a household water sample reports specific concentrations of substances present in that home's water, which may differ from public system data. The report typically includes detected levels, comparison to regulatory standards, and guidance on any treatment needed. For safe drinking water, it is essential to test your own tap water since public system figures reflect average conditions, not individual household variation influenced by internal plumbing.

What questions do commercial or industrial operators ask beyond household concerns?

Commercial and industrial operators often consider water use volume, process-specific purity requirements, and regulatory compliance at a larger scale. They may inquire about cumulative effects on machinery or production quality. Compared to households, these operators require water data covering broader parameters and continuous monitoring, while residential users focus primarily on safe, palatable drinking water within their home environment.

What should you write down before seeking advice on water treatment options?

Before consulting specialists about water treatment, note the following: the public water system's source type (surface water), the number of health-based violations in recent records, and the date and results of any recent water tests you have. Specifically, Exeter's public system has recorded 22 health-based violations out of 24 total, but lead levels in distributed plumbing tested at 0 mg/L (90th percentile) as of the end of 2024. This information frames your home's potential water quality context and helps identify appropriate treatment choices.

How does seasonal or multi-year variation appear in Exeter's water quality records?

Water quality in sources like Exeter's surface water can vary seasonally due to factors such as weather and land use changes. Multi-year trends help understand whether constituent levels are stable, improving, or deteriorating. The public record dates and ranges indicate fluctuations over time but do not predict individual household water quality. Home testing remains necessary for current, specific data.

What should you NOT conclude from Exeter area water data?

The regional public water system record does not determine the exact safety or aesthetic quality of your household's water. Detection of a substance in the system is not a safety violation and exceeding certain aesthetic thresholds does not mean health risk. Moreover, no lead has been detected in the system's plumbing distribution at the 90th percentile. Therefore, do not assume your well or tap water matches the public system data or carries the same risk profile without personal testing. Choosing the right treatment, such as the Pentair Safe Drinking Water Filter, depends on knowing your home's individual water quality and the specific contaminants you need to address.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2024-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA SDWIS record for EXETER WATER DEPT (NH0801010), surface water supply, serving 12236 people: 22 health-based violations of 24 total; lead 90th percentile 0 mg/L