The water that reaches homes in Portsmouth, Rockingham County, New Hampshire, is supplied from surface water sources managed by Portsmouth Water Works. This system serves about 33,000 residents through roughly 7,200 connections. The water undergoes treatment and distribution processes before arriving at individual households.
If Your Household Is Large, Has Multiple Residences, or Uses Water Seasonally
Household water use affects how you consider perchlorate treatment. Larger households or properties with more occupants use more water daily, which can impact treatment capacity needs. Similarly, if you have a second home or use your property seasonally, variations in water use influence how perchlorate treatment might be sized or maintained. Understanding your typical water consumption pattern helps plan the correct approach if perchlorate reduction is needed.
If You Want to Narrow Down Possible Perchlorate Sources Before Testing
Start with local water quality information available from public sources. The Portsmouth Water Works system underwent federal monitoring for unregulated contaminants, including perchlorate, between 2001 and 2005. During that period, 16 samples showed no detected perchlorate above 4.0 micrograms per liter, which was the reporting threshold. While this does not establish conditions in your household plumbing or well, it indicates that perchlorate was not measurable at levels above this threshold in the public supply.
Since perchlorate presence can vary by water source and over time, this background helps prioritize whether further testing of your household water is advisable.
If You Wonder How Plumbing Material and Age Affect Household Perchlorate Levels
Perchlorate originates primarily from environmental sources and industrial uses, not plumbing materials. Therefore, the type or age of plumbing in your home does not affect perchlorate concentrations. However, older plumbing can influence other water quality factors unrelated to perchlorate, so it is useful to differentiate source water quality from household system effects.
If You Consider Seasonal or Multi-Year Variations in Perchlorate Levels
The federal monitoring data from Portsmouth Water Works cover July 2003 to November 2004 and show no perchlorate detected above the 4.0 µg/L reporting level in all 16 samples. This suggests consistent low levels over the monitored period. Seasonal or paper multi-year fluctuations would likely have been captured if perchlorate levels had varied significantly in the public supply during that time.
If You Want to Understand the Monitoring Record's Range and Median for Your Home
The monitoring record from this system showed zero detections above 4.0 µg/L perchlorate, so a median or range of detected perchlorate concentrations within the public water is effectively below that detection level. For your household water, only direct testing can provide actual perchlorate levels, since sources or household connections may vary.
If You Question the Significance of the Monitoring Sample Size and Coverage
Sixteen samples collected over roughly 16 months represent a limited but federally standardized monitoring effort for this system. While it provides a useful snapshot of perchlorate presence in public water, it does not substitute for testing your household water. The samples reflect the system's supply water quality, not conditions within specific residences or private wells.
To determine perchlorate levels in your home's water supply, a certified laboratory test is essential. This single test will clarify whether perchlorate is present above the minimal detection threshold in your household water.
For homeowners seeking to address perchlorate effectively, the Pentair Perchlorate Filter provides a documented solution that ships ready to configure for residential water treatment needs. Using proven technology, it can reduce perchlorate levels detected after testing, helping manage water quality concerns specific to your household.
Ordering a direct laboratory analysis of your household water sets the foundation for deciding on perchlorate management steps. With accurate testing, you can confidently evaluate whether treatment equipment like the Pentair Perchlorate Filter is suitable for your situation.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2004-11-30. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR1 monitoring (2001-2005) for PORTSMOUTH WATER WORKS (NH1951010), NH: 16 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level