Lead in Water Program

  • Testing Methodology and Protocol

    Purpose

    The district goal is to provide lead safe drinking water sources throughout all its facilities. This will include identification of water sources that are considered drinking sources and testing and follow-up procedures.

    Methodology

    This program is modeled after the Minnesota Department of Health’s “Reducing Lead in Drinking Water: A Manual for Minnesota’s Schools.” The program identifies potable water sources, sources for lead, and outlines follow-up procedures for fixtures testing high in lead content.

    Testing Protocol:

    1. Sample collection is performed on Sundays (low use day) to obtain a “worst case” sample of the drinking water a person may consume from a fixture.
    2. The water is the “first draw” of water from a fixture.
    3. The sample collection size is 250 ml.
    4. The samples a sent to a Minnesota Department of Health (MDH) approved lab for analysis or analyzed with an approved anodic stripping voltammetry method.
    5. Test results should be at or below 20 parts per billion (ppb).
    6. All drinking water sources shall be sampled every five years.

    Drinking water sources include:

    • Drinking fountains
    • Sinks in classrooms (exception science lab rooms in junior and senior highs).
    • All kitchen area sources.
    • All nurse/heath area sources.
    • Water dispensers (not bottled).
    • Restroom sinks.
    • Office sinks.
    • Boiler Room sinks and first draws.
    • Additional sources may be added if they are identified as sources of consumption by facility occupants.

    High Test Results

    Fixtures testing above 20 ppb shall have a follow-up sample collected as outlined above AFTER the water has ran for 15 seconds. If the sample analysis is at or below 20 ppb, this fixture is safe for drinking anytime provided it has been flushed for 15 seconds.

    Fixtures failing the “flush test” shall be either turned off until replacement of the fixture or labeled as not recommended for consumption.

Additional Information