How to Create a Simple and Defensible Drinking Water Testing Plan

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December 1, 2024 | Contributors:

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A parent asks if the hallway fountain at school is safe. An employee complains about “metallic-tasting” coffee water. A nurse wonders whether the ice machine on the third floor has ever been tested. If you run a school, a business, or a hospital, sooner or later you’ll face the same worry: Is the water we’re offering people actually safe to drink?

Municipal utilities test and treat water before it reaches your property line. After that, the “last mile” is your responsibility—your pipes, your fixtures, your stagnation points. That’s where a practical, written, repeatable drinking water testing plan comes in. “Defensible” simply means you can show regulators, stakeholders, and the public why you tested what you tested, how you did it, what you found, and what you did next.

Take the following steps to make sure your drinking water testing plan helps keep your people healthy and regulators happy.

Clarify Your Drinking Water Testing Plan Purpose.

Decide which points you’re trying to prove—or disprove.

  • Are our drinking fixtures below action levels for lead and copper?
  • Is our disinfectant residual adequate all the way to point of use?
  • Do we have microbial risks (total coliforms, E. coli, Legionella) hiding in low-use lines?
  • Are any “emerging contaminants” like PFAS a local concern we need to check?

Tie those goals to the people who drink the water: children in schools, immunocompromised patients in hospitals, pregnant workers in offices. That keeps the plan human—and prioritized.

Know the Drinking Water Testing Regulations

Yes, there are laws and guidance documents. No, you don’t have to memorize them all.

  • Safe Drinking Water Act (SDWA) and the EPA Lead and Copper Rule spell out the federal baselines.
  • Many states now mandate lead testing in Childcare Centers and K–12 (check your state’s health or education department).
  • Healthcare facilities should be aware of ASHRAE 188 (Legionella management) and, for device reprocessing water, AAMI ST108.
  • Local health departments often issue advisories or require specific testing after outages or renovations.

Make a one-page “Drinking water testing plan regulations” cheat sheet and stick it in your binder or shared drive.

Make Sure Someone Is Responsible for Water Testing

Water testing shouldn’t be everyone’s job—which means it’s no one’s job.

  • Designate a program lead (Facilities, EHS, or Operations).
  • Loop in maintenance staff, safety/HR, a communications person, and (in schools/hospitals) a nurse or infection prevention specialist.
  • Decide who signs off on results, who talks to the public, and who authorizes corrective action.

Map the System: From Input to Output

Even a crude diagram helps. You’re hunting for risks, not drafting an engineering textbook.

  • Show where the municipal line enters and where your plumbing branches.
  • Flag high-risk fixtures: old fountains, classroom sinks, clinic hand-wash stations, ice machines, breakroom coolers.
  • Mark dead-ends, storage tanks, and wings that sit idle (examples include summer break or construction closures).

A map tells you where to test—and later, where to fix things.

Decide What to Test (Parameters + Why)

Testing everything, everywhere, all the time is a budget killer. Be selective and explain your choices.

  • Core drinking-water parameters: lead, copper, bacteria (e.g., heterotrophic plate count), and disinfectant residual (chlorine/chloramine).
  • Add Legionella if you have showers, cooling towers, or medically vulnerable populations.
  • Consider PFAS, nitrates, or manganese/iron if your region or history suggests a problem.
  • For lead, choose first-draw vs. flushed samples based on the protocol you’re following (often you’ll do both to pinpoint where lead is coming from).

Pick the Locations and Frequency You Can Defend

You need a plan that hits the likely worst cases and still fits your budget and staff time.

  • Choose “sentinel” sites: representative high-risk fixtures and a handful of random spots.
  • Test at key times: baseline (when you start the program), routine intervals (annual or biannual), and after events (renovations, shutdowns, boil notices).
  • Document the rationale: “We tested these 12 fountains because they’re pre-1986 fixtures and see heavy student use.”

Write the SOP (Standard Operating Procedure)

If it isn’t written, it isn’t real. An SOP keeps sampling consistent even when staff change.

  • Spell out: water testing bottle type, tap flushing or no flushing, exact sample volume, preservatives, chain-of-custody steps, and shipping instructions.
  • Include simple QA/QC: a few duplicates and blanks (5–10%) show you care about data quality.
  • Train your people and stick the SOP where they can find it fast.

Choose a Certified Lab (Ask the Right Questions)

Not all labs test everything, and not all are certified for your state. For help identifying the correct lab for drinking water testing, contact FACS.

  • Confirm certification for each parameter you want.
  • Ask about detection limits, turnaround times, and whether they flag exceedances in the report.
  • Clarify who provides drinking water testing bottles, preservatives, and how shipping is handled.
  • Request reports in a format you can easily paste into your records and share with stakeholders.

Interpret Your Drinking Water Testing Results

Numbers only matter if you know what they mean and base your decisions on the information gathered. Face the data squarely.

  • Set action thresholds up front (regulatory levels plus your own stricter “internal triggers” if you have sensitive populations).
  • Build a decision tree: “If lead > X, shut off fixture, install filter, retest in Y days.”
  • Consider context: a single total coliform positive demands follow-up, but an E. coli positive is an immediate red flag.
  • Don’t over-reassure or catastrophize. People can detect both.

Corrective Action: Short-Term vs. Long-Term

Think triage first, surgery second.

  • Immediate steps: remove a fountain from service, post signage, flush lines, install certified point-of-use filters.
  • Long-term fixes: replace leaded fixtures or segments of pipe, adjust corrosion control, add secondary disinfection, or institute a formal Legionella water management plan.
  • Always retest after you fix something. Proof beats promises.

Communicate Clearly (Up, Down, and Out)

Water risk is as much about trust as it is about chemistry.

  • Internal: brief leadership, maintenance, school boards, infection prevention committees.
  • External: parents, patients, employees, the public—use plain language, define terms, and show the action steps.
  • Post consistent updates: “Here’s what we tested, here’s what we found, here’s what we’re doing, here’s when we’ll retest.”
  • Transparency calms nerves—and heads off rumors.

Keep Drinking Water Testing Records

If you ever have to defend your program, your records are Exhibit A.

  • Log sampling dates, locations, parameters, lab results, and corrective actions.
  • Save chain-of-custody forms, lab certifications, and SOP revisions.
  • Review your records annually: did anything change (new wing, long shutdown, chemistry shift from the supplier)? Update accordingly.

Budget Your Drinking Water Testing Plan and Stage It

Water safety is an ongoing cost—plan for it.

  • Estimate lab fees, staff time, filtration hardware, fixture replacements.
  • Prioritize: tackle the highest-risk fixtures and parameters first; expand when budget allows.
  • Fold replacement projects into capital planning

A defensible sampling plan is not a one-and-done document. It evolves as your building, your occupants, and your water chemistry change. The “defense” is the story you can tell: why you cared, how you tested, what you found, and what you did next.

For help beginning or monitoring your drinking water testing plan, get FACS on your side. Call us at (888) 711-9998 or contact us online here: https://facs.com/contact-us.