EPA WaterSense certified filters: Water efficiency and Legionella protection in one device

EPA WaterSense-certified filters are becoming increasingly important across healthcare, hospitality, and senior living as water-efficiency requirements expand across the US, especially on the West Coast, where several states now require WaterSense-level standards by law. 

At the same time, water management programs under ASHRAE 188 continue to demand control of Legionella and other opportunistic pathogens at the point of use.

These two objectives usually sit in separate scopes of work. One team manages flow rates and conservation. Another manages biofilm and exposure risk. The gap opens at the last fixture before the occupant.

PurGuard360® and TapTech Pro® deliver both EPA WaterSense-certified water efficiency and certified Log 10 bacterial reduction at the point of use. 

One installation. One purchase order. One Water Management Plan line item that satisfies both.

What is EPA WaterSense certification? 

An EPA WaterSense-certified filter is a point-of-use water device that meets independently verified water-efficiency standards established through the EPA WaterSense program. 

To qualify, filters must:

• Be independently tested by third-party laboratories

• Meet strict flow-rate thresholds, typically around 2.0 GPM or lower, depending on fixture type, with some state rules going stricter, such as California's 1.8 GPM standard. 

• Maintain spray force and coverage standards under EPA test protocols

• Demonstrate consistent performance across production batches

WaterSense labeling is widely referenced in federal procurement guidelines and green building frameworks, including LEED-aligned specifications.

For facility teams, the key relevance is not just water reduction, but standardized verification of performance under regulated conditions.

Why water efficiency requirements matter more than ever?

Water efficiency has shifted from sustainability reporting to operational compliance in many jurisdictions.

Key drivers include:

• Water scarcity, drought, and regional water crises 

• Municipal water stress and infrastructure strain

• State-level plumbing code updates

• Federal procurement alignment through FEMP guidelines

• Healthcare and senior living sustainability reporting requirements

• Green building certification systems

Several states and cities now enforce flow-rate restrictions or WaterSense-aligned requirements for shower fixtures. California, Washington, Oregon, and Hawaii sit at the strict end, typically 1.8 to 2.0 GPM. New York City requires WaterSense by green building code. 

For facility engineering teams, the message is simple. Any fixture upgrade or retrofit has to account for water-efficiency compliance from the start. 

Water efficiency alone does not address Legionella risk

Conservation regulates how much water a fixture uses. It says nothing about what grows inside the system that feeds it.

These are two different problems. Water efficiency governs consumption. Water safety governs bacterial growth and aerosol exposure. Legionella exposure concentrates at terminal points, showers, and faucets, where water is aerosolized and inhaled. In healthcare and senior living, that fixture is a critical control point under an ASHRAE 188 water management plan.

A code-compliant low-flow showerhead saves water. It does nothing about Legionella at the fixture. A facility in a mandated state can meet the efficiency code and still leave exposure live at the point-of-use, where temperature drops, mist forms, and the most vulnerable occupants breathe it in.

Two products close that gap in one installation. 

PurGuard360®: WaterSense shower filter with Log 10 protection

PurGuard360® is an EPA WaterSense-certified handheld shower filter that also delivers certified Log 10 bacterial reduction.

✔️ 1.8 GPM certified flow, meeting the strictest statewide mandates 

✔️ Log 10 bacterial reduction, certified per ASTM F838-20 

✔️ 0.08 µm hollow fiber membrane, no measurable pressure drop 

✔️ 150-day service life, FDA-registered, IAPMO-certified

Available in a 7cm compact head and a 15cm head with three spray modes.

TapTech Pro®: certified faucet filtration at the tap

TapTech Pro® brings the same certified protection to the tap. 

✔️ WaterSense-compliant flow rate 

✔️ Log 10 certified bacterial reduction at the aerator 

✔️ 0.08 µm membrane, 180-day service life 

✔️ Tool-free install on standard aerator threads in under three minutes

It fits hospitals under federal procurement, hotels and senior living in mandate states, dental clinics and labs, and schools and government buildings under local code.

Water efficiency and water safety should not be separate decisions  

Water-efficiency compliance and pathogen control are converging in facility water management, and they're increasingly evaluated together.

WaterSense certification answers the consumption standard. Point-of-use filtration answers the exposure risk at the terminal fixture. PurGuard360® and TapTech Pro® bring both into a single installation point, across healthcare, senior living, and hospitality, where water performance and occupant safety now sit in the same review.

As more facilities evaluate fixture upgrades, retrofits, and water management plans, the conversation is no longer just about saving water. It's about documenting both efficiency and risk reduction at the point of use.

Explore how MWT EPA WaterSense-certified filtration can support your facility's water management objectives, or contact the MWT team for a technical consultation on point-of-use protection strategies.