You might notice a metallic taste or be worried about the presence of lead in your household water from Manchester’s public supply. Such concerns are common, especially for families in Hillsborough, NH, who want to understand if the water coming through their taps is affected.
What does the lead concentration recorded by Manchester Water Works mean compared to federal standards?
Manchester Water Works, serving over 123,000 people in Hillsborough County, has a lead 90th percentile measurement of 0 mg/L as of December 31, 2022. This percentile is a key federal measure under the EPA’s Lead and Copper Rule indicating the concentration below which 90% of samples fall. A value of zero means that in the sampled sites, the lead level was below the detectable threshold. Importantly, no health-based violations for lead have ever been reported for this system. This indicates that at the system level, lead concentrations have been within EPA’s action levels, but it does not guarantee that every household’s water is free from lead.
How does lead data from multiple years and seasons show consistency or variation?
The lead data from Manchester Water Works are collected periodically and reflect multiple sampling locations across the distribution system. The zero measurement at the 90th percentile level from late 2022 suggests stability in lead levels at the system scale. Though lead concentrations can vary seasonally or over longer time frames due to changes in water chemistry or pipe conditions, the absence of recorded violations over recent years points to consistently low lead presence in public water. Still, these measurements do not capture localized changes that may occur in household plumbing over time.
What do terms like 'detected', 'median', and 'range' mean in the context of this lead sampling record?
In the EPA’s sampling data, a 'detection' means that the testing instruments measured a certain lead concentration, but this does not mean the level is harmful or legally problematic. The 'median' is the middle value of all sampled points and 'range' covers the lowest to highest lead concentrations found in the samples. In Manchester’s case, the 0 mg/L 90th percentile value indicates that the majority of samples had non-detectable lead levels, yet individual household readings might differ due to plumbing materials or other factors.
How is lead different from other common water quality issues often confused with it?
Lead differs significantly from problems related to water hardness, iron, or microbial contamination. Unlike these, lead primarily enters water through corrosion of plumbing materials like lead pipes, solder, or brass fixtures rather than from the water source itself. For Manchester’s surface water system, source water lead contamination is not the issue; rather, any lead present in a home’s water typically comes from household plumbing. This distinction is critical because addressing lead requires treatment targeted at removing particulate metals from water after it leaves the public supply.
How does lead typically enter residential water in Hillsborough from the distribution system?
Although Manchester’s public water system delivers water with negligible lead levels as measured at the distribution, lead may leach into water inside residences from plumbing materials that contain lead. This can happen when water sits in pipes overnight or where pipe corrosion occurs. Surface water supply and treatment practices in Manchester control the background lead concentration, but the final lead levels in household taps depend strongly on internal plumbing conditions and water chemistry.
If you suspect lead is present in your home's water, the most reliable next step is to have your household water tested specifically for lead concentration. This direct measurement will reveal your unique water quality regardless of system-wide data. If lead is confirmed, using a targeted treatment solution like the Autotrol Lead in Water Filter, which ships ready to configure, can effectively reduce lead levels to safer ranges by filtering out metallic particulates. Understanding your specific water situation ensures that solutions address your home’s needs accurately.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2022-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for MANCHESTER WATER WORKS (NH1471010), surface water supply, serving 123500 people: 0 health-based violations of 0 total; lead 90th percentile 0 mg/L
- ✓ 90-Day Money-BackNo restocking fees — return within 90 days.
- ✓ Manufacturer WarrantyGenuine Fleck · Pentair · VIQUA equipment.
- ✓ Free Expert SizingTalk to a specialist and buy the right system the first time.