1. What Do 'Detected', 'Median', and 'Range' Mean in the Lead Sampling Record for Biddeford-Saco?
The EPA's public water system record for the Maine Water Company Biddeford-Saco Division reports a lead 90th percentile level of 0 mg/L based on sampling dated December 31, 2024. This 90th percentile value reflects the concentration found in tap water samples within the distribution system, including building plumbing, not the raw source water. 'Detected' means the instrument measured lead at some samples, while 'median' and 'range' describe central tendency and variability among samples, though this record only specifies the 90th percentile. A 90th percentile of 0 mg/L indicates that at least 90% of samples showed no measurable lead presence at the time of sampling, but it does not guarantee zero lead in any individual household.
2. How Should You Compare York County’s Lead Data with Nearby Areas Without Overreading It?
When looking at lead levels in York County's Biddeford-Saco system versus neighboring water systems, it's important to focus on the system-wide sampling statistics rather than individual homes. Variations in lead can arise from differences in plumbing materials, water chemistry, and treatment processes unique to each system. A zero 90th percentile in Biddeford-Saco indicates lower detected lead levels system-wide compared to other areas that may report higher percentiles, but differences do not imply that one area is universally better or worse for every household. Also, any detection—even if greater than zero—is not itself a safety violation unless an EPA health-based standard is exceeded. York County’s system currently has one health-based violation unrelated to lead, affirming that lead measurements here are separate from any actual system violations.
3. What Is the Recommended Sequence to Narrow Down Lead Concerns From Simple Checks to Lab Tests?
Start by reviewing municipal water quality reports provided annually, which include lead sampling results, as you have here. Next, examine household plumbing materials: homes built before 1986 are more likely to have lead pipes or solder. Then, observe any visual signs such as discolored water or metallic taste, which do not confirm lead but suggest further investigation. Only after these steps should you collect water samples from your own taps for laboratory analysis specifically testing for lead, since system-wide data might not represent your household’s plumbing condition.
4. What Household Symptoms Might Indicate Lead Issues, and Which Do Not?
Common indicators that prompt lead testing include:
- Metallic or unusual taste and odor, although these are not definitive for lead
- Visible corrosion, such as blue-green stains on plumbing fixtures
- Water that appears discolored or rusty, which may suggest pipe deterioration
Symptoms not directly related to lead presence include general hardness or dryness of the water. Lead itself is odorless and tasteless at low levels. Therefore, absence of symptoms does not guarantee absence of lead, nor does their presence confirm it.
5. How Do Plumbing Materials and Age Affect Lead Presence Separately from the Source Water?
The Biddeford-Saco system uses surface water treated through multiple processes, reducing lead content from the source. Lead detected in household water often originates from internal plumbing materials like lead pipes, brass faucets, or lead solder, especially in homes built prior to lead regulations in the mid-1980s. Water chemistry, such as pH and corrosion control treatment, also influences how much lead leaches into water from pipes. Therefore, despite low systemic lead levels, older household plumbing may contribute to elevated lead concentrations locally.
6. Which Household Fixtures or Processes Are Most Likely to Show Elevated Lead First, and Why?
Fixtures nearest to where water enters the home—such as the kitchen cold water tap—commonly show higher lead levels because water can sit in lead-containing pipes or solder during periods of stagnation. Hot water heaters seldom contain lead and using hot water for drinking is not recommended; hence, testing cold water taps used for drinking and cooking is critical to assess potential lead exposure. Additionally, fixtures made from brass or bronze alloys may release lead into water over time.
Conclusion: To determine your household’s lead level accurately, order a lead test specifically for your tap water from a certified laboratory after flushing your pipes. A test result showing lead below the EPA’s action level can confirm low exposure risk and help decide if a treatment device like the Fleck Lead in Water Filter, which ships ready to configure, is warranted to reduce any detected lead.
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 MAINE WATER COMPANY BIDDEFORD SACO DIV (ME0090170), surface water supply, serving 42508 people: 1 health-based violations of 1 total; lead 90th percentile 0 mg/L