Safe Drinking Water Choices in Rockingham: What Exeter’s Public System Data Actually Tells You

If you live in Exeter, Rockingham County, and you're deciding which water treatment class your home requires for safe drinking water, this week’s key task is interpreting the public water system data accurately before making any choices.

Myth: Water system sampling numbers tell you exactly what’s in your home’s tap water

The Exeter Water Department uses surface water sources and serves over 12,000 people. Their public water system record shows 22 health-based violations out of 24 total, according to EPA standards. However, these system-wide figures reflect conditions and compliance for the entire distribution network, not the water at individual taps. For instance, lead sampling at the 90th percentile was 0 mg/L in 2024, but this relates primarily to plumbing variations and does not describe the source water or every connection specifically.

Myth: Terms like 'detected', 'median', and 'range' in water testing imply a safety concern

The EPA’s use of 'detected' means a constituent was measured by instruments, but detection alone does not indicate a health violation or unsafe level. Similarly, 'median' and 'range' describe statistical distribution across samples, not a compliance boundary. These terms help show variability but do not establish the safety or quality status of your specific household water.

Myth: You can choose water treatment without precise information about your own water quality

Before selecting treatment, write down what you know about your water: Do you receive Exeter Water Department service? Have you tested your home’s tap water for specific concerns beyond the public record? Public data can guide your decisions but cannot replace individual testing. This record highlights regional trends but not your home’s exact water chemistry.

Myth: Comparing Exeter’s water record directly to other counties’ records clarifies treatment needs

While neighbouring Rockingham counties may have different public water system data, direct comparisons should be made cautiously. Each system varies by source water type, treatment practices, and infrastructure. A difference in reported health-based violations or constituent ranges does not automatically translate into better or worse water quality for your residence.

Myth: Simple at-home checks or visual inspections are enough before costly water testing

Rule out common issues progressively. Start with observing any unusual taste, odor, or staining. Then, explore local public water advisories. If concerns persist, professional laboratory testing of your tap water provides the definitive indication of what treatment class you need.

Worked Example: Understanding the median and range from Exeter’s system as a homeowner

The Exeter Water Department’s health-based records signal that some violations were identified historically, but these data cover all system samples and time periods. The zero value for lead at the 90th percentile in recent sampling means most homes tested had negligible lead levels from plumbing sources. Yet this does not guarantee every tap is lead-free, nor does it specify other contaminants’ levels in your home.

Determining your safe drinking water solution starts with knowing what your water contains and what the public system data can and cannot reveal.

The Fleck Safe Drinking Water Filter ships ready to configure and offers a reliable method to address many residential treatment needs once you identify your water’s demand figures. It supports confident action after you’ve understood your household water in context with Exeter’s system record.

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