Education is the foundation of clean water.
In Hawai‘i, where thousands of homes rely on rainwater catchment systems without oversight, knowledge is the most important safeguard. Uncle Tilo’s Clean Water equips households with clear, practical education to understand their systems, reduce health risks, and make informed decisions. When people are educated, water quality improves, systems last longer, and families stay healthy.
Education turns catchment users into confident Rainwater Harvesters—and clean water into a daily reality.
In Hawai‘i, where thousands of homes rely on rainwater catchment systems without oversight, knowledge is the most important safeguard. Uncle Tilo’s Clean Water equips households with clear, practical education to understand their systems, reduce health risks, and make informed decisions. When people are educated, water quality improves, systems last longer, and families stay healthy.
Education turns catchment users into confident Rainwater Harvesters—and clean water into a daily reality.
Thank you for your trust and business!
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In Hawai‘i, there is no government oversight regulating residential rainwater catchment systems.
Responsibility rests entirely with the owner/user to understand, manage, and protect their water supply.
From home to community
Beyond residential use, rainwater catchment systems support critical commercial and community applications—including schools, agriculture, businesses, camps, and military installations. Onsite rainwater harvesting enables essential services in locations where traditional water infrastructure is unavailable, impractical, or cost-prohibitive.
What’s required to maintain a catchment system?
Proper system maintenance is essential. Roofs, conveyance piping, and storage tanks must be kept clean, while filtration and water disinfection systems are required to eliminate bacteria, viruses, and protozoa that pose health risks. Catchment users are fully accountable for their water supply and must routinely monitor system performance through regular maintenance and water testing. Catchment users are their own water department.
Is my water safe?
Water safety means the absence of harmful bacteria, viruses, chemicals, and metals. Ultimately, water quality is determined by system design and ongoing maintenance. When proper filtration, disinfection, and maintenance practices are in place, rainwater catchment systems can reliably provide water that is safe for all household uses—including drinking.
Is rainwater catchment common?
Rainwater catchment is a proven water strategy used worldwide, including in India, England, Germany, China, Japan, Australia, and New Zealand. In the United States, several states actively promote or permit rainwater harvesting, including Hawai‘i, California, Texas, Oregon, Washington, Florida, Ohio, and Kentucky. When properly designed, maintained, and treated, rainwater catchment systems provide a reliable, self-sustaining water supply with minimal contamination—suitable for drinking, bathing, food preparation, and household use.
A 2010 University of Hawai‘i CTAHR report estimated that 30,000–60,000 Hawai‘i residents relied on rainwater catchment systems at that time. While portions of the document were updated in 2020, the population data itself was not re-evaluated. Given significant growth and new catchment construction since then, the true number today is substantially higher, though no updated statewide study currently exists.
A 2010 University of Hawai‘i CTAHR report estimated that 30,000–60,000 Hawai‘i residents relied on rainwater catchment systems at that time. While portions of the document were updated in 2020, the population data itself was not re-evaluated. Given significant growth and new catchment construction since then, the true number today is substantially higher, though no updated statewide study currently exists.
Water Quality Risks in Hawai‘i
Rainwater catchment systems are vulnerable to multiple sources of pollution. Volcanic activity, land fires, and other emission events release smoke, ash, and fine particulates that can settle on roofs and be washed into storage tanks. These emissions may also combine with atmospheric moisture to create acid rain, further impacting water quality.
Agricultural areas present additional risk through pesticide drift when sprays are improperly applied. Vegetation near roofs and gutters can cause blockages, introduce organic debris, promote microbial growth, and attract insects, birds, and animals whose waste contaminates collected water. Rodents, particularly rats, pose significant health risks and can easily access roofs via branches and utility lines.
Poor system design compounds these risks. Downspouts that retain water between rain events can create stagnant conditions that bypass treatment and attract pests. Damaged or unsecured tank covers allow animals direct access to stored water, increasing contamination risk. Unmanaged tank overflow can undermine foundations, damage liners, and lead to structural failure.
Clean water requires awareness, proper design, and active management. Proactive planning and routine maintenance are essential to protect water quality and ensure the safe use of rainwater catchment systems in Hawai‘i.
Agricultural areas present additional risk through pesticide drift when sprays are improperly applied. Vegetation near roofs and gutters can cause blockages, introduce organic debris, promote microbial growth, and attract insects, birds, and animals whose waste contaminates collected water. Rodents, particularly rats, pose significant health risks and can easily access roofs via branches and utility lines.
Poor system design compounds these risks. Downspouts that retain water between rain events can create stagnant conditions that bypass treatment and attract pests. Damaged or unsecured tank covers allow animals direct access to stored water, increasing contamination risk. Unmanaged tank overflow can undermine foundations, damage liners, and lead to structural failure.
Clean water requires awareness, proper design, and active management. Proactive planning and routine maintenance are essential to protect water quality and ensure the safe use of rainwater catchment systems in Hawai‘i.
Self-reliant, environmentally responsible, off-grid living makes sense.
Rainwater catchment leverages natural resources to reduce runoff and promote conservation. When paired with solar and off-grid systems, it enables sustainable living without depleting the earth’s resources. As a truly green solution, catchment plays a vital role in the reduce, reuse, and recycle cycle.
Quantum Disinfection vs Ultraviolet Light Systems
Quantum Disinfection™ vs. Class B UV, A Clear, Standards-Based Comparison
Choosing a water disinfection system is a critical decision that directly impacts household health, long-term costs, and system reliability. In Hawai‘i, the two most common options for catchment and treated water systems are Quantum Disinfection™ and Class B Ultraviolet (UV) systems. While both are widely used, they differ significantly in how they work, what they require, and what they truly cost over time.
Quantum Disinfection™ — by CLAIRE Technologies
Uses advanced nanocomposite ceramic catalyst media designed to kill pathogens on contact as water passes over the media. This process does not rely on electricity, chemicals, or moving parts.
Class B UV Systems — Power-Dependent, Inactivation
Class B UV systems use ultraviolet light to inactivate microorganisms and must be applied to properly treated water. They do not kill pathogens and are not intended for raw or untreated water entering the system.
Key considerations:
Quantum Disinfection™
Quantum Disinfection™ kills pathogens through catalytic action with no electricity or maintenance, while Class B UV inactivates microorganisms under optimal flow and clarity conditions and requires electrical power and periodic bulb/sleeve replacement.
UTCW Perspective At Uncle Tilo’s Clean Water, we believe homeowners deserve clear facts, verified standards, and real-world performance—not marketing hype. That’s why we focus on education first, helping you choose solutions that protect your water, your health, and your investment.
Quantum Disinfection is next-generation water protection—done right.
No chemicals. No power. No maintenance. No pathogens. Proven protection.
Quantum Disinfection™ vs. Class B UV, A Clear, Standards-Based Comparison
Choosing a water disinfection system is a critical decision that directly impacts household health, long-term costs, and system reliability. In Hawai‘i, the two most common options for catchment and treated water systems are Quantum Disinfection™ and Class B Ultraviolet (UV) systems. While both are widely used, they differ significantly in how they work, what they require, and what they truly cost over time.
Quantum Disinfection™ — by CLAIRE Technologies
Uses advanced nanocomposite ceramic catalyst media designed to kill pathogens on contact as water passes over the media. This process does not rely on electricity, chemicals, or moving parts.
- Kills bacteria, viruses, and protozoa through catalytic surface interaction
- No electricity required
- No bulbs, sleeves, or annual replacements
- No routine maintenance
- Designed for whole-house or point-of-use applications
Class B UV Systems — Power-Dependent, Inactivation
Class B UV systems use ultraviolet light to inactivate microorganisms and must be applied to properly treated water. They do not kill pathogens and are not intended for raw or untreated water entering the system.
Key considerations:
- Requires continuous electrical power
- Annual bulb replacement (contains mercury)
- Quartz sleeve replacements
- Ongoing electricity costs
- Performance depends on flow rate, water clarity, low in solids and turbidity and power stability
- Mercury bulbs require hazardous waste disposal
Quantum Disinfection™
- NSF/ANSI 42 → material safety
- NSF/ANSI 61 → health effects / potable water contact
- Claims: Kills pathogens via catalytic action
- Certification scope: Material safety
- NSF/ANSI 55 Class B → UV inactivation performance
- May also carry NSF/ANSI 61 for materials
- Claims: Inactivates microorganisms only
- Certification scope: Performance under specific conditions
Quantum Disinfection™ kills pathogens through catalytic action with no electricity or maintenance, while Class B UV inactivates microorganisms under optimal flow and clarity conditions and requires electrical power and periodic bulb/sleeve replacement.
UTCW Perspective At Uncle Tilo’s Clean Water, we believe homeowners deserve clear facts, verified standards, and real-world performance—not marketing hype. That’s why we focus on education first, helping you choose solutions that protect your water, your health, and your investment.
Quantum Disinfection is next-generation water protection—done right.
No chemicals. No power. No maintenance. No pathogens. Proven protection.
Quantum Disinfection
R.V.'s Boats Grow Houses Garden Sinks Restaurants/Coffee Houses Ice Makers Refrigerators
Dentist Chairs & Household Use & Consumption
Dentist Chairs & Household Use & Consumption
The quality of your water is a direct link to the quality of your health.
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Building Materials
Only FDA- or NSF-approved materials should be used when collecting rainwater for drinking, bathing, and household use. Building materials must be non-toxic and chemically inert, ensuring they do not leach harmful substances under normal conditions—or under acid rain exposure.
In Hawai‘i, volcanic emissions can increase rainwater acidity, accelerating the leaching of metals and chemicals from unsuitable materials. Selecting the right components is critical to protecting water quality and long-term system performance.
Proper mineralization of tank water helps stabilize pH and forms a protective coating on metal components, reducing corrosion within pumps, plumbing, and hot water heaters.
Material choice matters. Water chemistry matters. Protection starts at the source.
In Hawai‘i, volcanic emissions can increase rainwater acidity, accelerating the leaching of metals and chemicals from unsuitable materials. Selecting the right components is critical to protecting water quality and long-term system performance.
Proper mineralization of tank water helps stabilize pH and forms a protective coating on metal components, reducing corrosion within pumps, plumbing, and hot water heaters.
Material choice matters. Water chemistry matters. Protection starts at the source.
Roofing
Roofing materials used for rainwater catchment must be safe, non-toxic, and approved for potable water collection. The most common and reliable option is galvanized metal coated with NSF-approved, non-toxic paint. Other suitable materials include concrete, terracotta tile, slate, and polycarbonate.
Roof coatings must be free of fungicides, pesticides, and harmful additives that can contaminate collected water. Any materials containing lead must be avoided, as lead exposure poses serious health risks. Older homes present higher risk, since lead-based paints were common prior to 1978; testing is strongly recommended before using these roofs for catchment.
Avoid roofing materials such as uncoated galvanized metal, zinc, asbestos-containing materials, tar, asphalt, or pesticide-treated wood, as they can leach contaminants—especially under Hawai‘i’s acid rain conditions.
Safe materials protect water quality, health, and system longevity.
Roof coatings must be free of fungicides, pesticides, and harmful additives that can contaminate collected water. Any materials containing lead must be avoided, as lead exposure poses serious health risks. Older homes present higher risk, since lead-based paints were common prior to 1978; testing is strongly recommended before using these roofs for catchment.
Avoid roofing materials such as uncoated galvanized metal, zinc, asbestos-containing materials, tar, asphalt, or pesticide-treated wood, as they can leach contaminants—especially under Hawai‘i’s acid rain conditions.
Safe materials protect water quality, health, and system longevity.
Gutters
Gutters used for rainwater catchment must be constructed from inert, non-reactive materials. Commonly accepted options include seamless aluminum, PVC, or CPVC plastic. Copper is not suitable for gutters intended to collect household rainwater due to the risk of metal leaching.
Proper installation is critical. Gutters must maintain a consistent, slight downward slope toward the tank to prevent pooling, backflow, or stagnant water. Standing water attracts insects and animals and allows leaves and organic debris to accumulate. As organic matter decays, it can degrade water taste, color, and quality, increasing the risk of contamination and potential health concerns.
Material selection and proper slope protect water quality from the very first point of collection.
Leaf Screen
Gutter and downspout screens provide the first line of defense against large debris entering the storage tank. Gutter screens require monthly maintenance to remain effective, while downspout screens offer the same protection with easier access and simpler upkeep, often without the need for a ladder.
Screens installed at a slight angle allow debris to shed naturally, reducing buildup and improving overall system performance.
Simple screening, maintained regularly, protects water quality and reduces system maintenance.
Screens installed at a slight angle allow debris to shed naturally, reducing buildup and improving overall system performance.
Simple screening, maintained regularly, protects water quality and reduces system maintenance.
First Flush Diverter
A properly sized First Flush Water Diverter is essential to protecting water quality. It prevents the initial runoff from the roof—where contaminants accumulate—from entering the tank, reducing both contamination risk and tank maintenance.
The first flush of rainwater often carries bacteria from decomposed insects, bird and animal droppings, tannic acids, sediments, heavy metals, and chemical residues. By diverting this initial runoff away from storage, the system ensures cleaner water enters the tank.
First flush diversion removes contaminants at the source—protecting water quality before it reaches the tank.
The first flush of rainwater often carries bacteria from decomposed insects, bird and animal droppings, tannic acids, sediments, heavy metals, and chemical residues. By diverting this initial runoff away from storage, the system ensures cleaner water enters the tank.
First flush diversion removes contaminants at the source—protecting water quality before it reaches the tank.
Overflow Device
A properly designed overflow serves two critical functions: it safely routes excess water out of the tank and removes floating debris from the water’s surface. Providing a controlled exit path prevents overfilling, protects tank platforms, and reduces structural stress on the storage container. Surface skimming of floating particulates supports a low-maintenance approach to improved water quality.
Managed overflow protects system integrity and preserves water quality.
Managed overflow protects system integrity and preserves water quality.
Floating Intake Device
Many catchment systems draw water from the bottom of the tank—where sediment, decaying leaves, and organic matter settle. This practice pulls debris into the system, accelerating filter clogging and increasing contamination risk.
A floating intake draws water from near the surface, where it is typically cleaner and contains fewer contaminants. This improves water quality, extends filter life, and reduces maintenance costs.
Cleaner intake means cleaner water, lower maintenance, and long-term savings.
A floating intake draws water from near the surface, where it is typically cleaner and contains fewer contaminants. This improves water quality, extends filter life, and reduces maintenance costs.
Cleaner intake means cleaner water, lower maintenance, and long-term savings.
Filters for Rainwater Catchment Systems
Filtration is a critical component of every rainwater catchment system. Filters remove particles and contaminants using materials such as sediment media, carbon, membranes, and specialized elements—each placed strategically for a specific function.
A typical home system includes a screen filter before the tank, followed by sediment and carbon filtration after the pump, and, where needed, fine filtration at the point of use. Sediment filters—ranging from 1 to 30 microns—capture particulate matter at the point of entry. Carbon and carbon block filters (typically 1 to 10 microns) reduce chlorine, metals, and organic compounds, improving clarity, taste, and odor.
Absolute 1-micron filters are designed to exclude protozoan cysts and are commonly installed at sinks or other point-of-use locations. Reverse osmosis (RO) membranes, operating under high pressure, allow water molecules to pass while blocking dissolved solids; these membranes are protected by upstream carbon filtration.
Proper filter selection, placement, and maintenance ensure effective treatment, protect downstream components, and safeguard water quality throughout the system.
A typical home system includes a screen filter before the tank, followed by sediment and carbon filtration after the pump, and, where needed, fine filtration at the point of use. Sediment filters—ranging from 1 to 30 microns—capture particulate matter at the point of entry. Carbon and carbon block filters (typically 1 to 10 microns) reduce chlorine, metals, and organic compounds, improving clarity, taste, and odor.
Absolute 1-micron filters are designed to exclude protozoan cysts and are commonly installed at sinks or other point-of-use locations. Reverse osmosis (RO) membranes, operating under high pressure, allow water molecules to pass while blocking dissolved solids; these membranes are protected by upstream carbon filtration.
Proper filter selection, placement, and maintenance ensure effective treatment, protect downstream components, and safeguard water quality throughout the system.
Free Community Education & Outreach
At Uncle Tilo’s Clean Water, education is not an add-on—it’s our foundation. We believe access to clean-water knowledge should be free, practical, and available to everyone who depends on rainwater for daily living.
Empowerment Through Education for Clean Water
Empowerment Through Education for Clean Water
- Free First Saturday classes, open to the public
- Real-world instruction on rainwater catchment, water quality, maintenance, and health
- Designed to turn catchment users into confident Rainwater Harvesters
- Free classroom-based education for students and educators
- Age-appropriate, hands-on learning focused on water stewardship, conservation, and responsibility
- Supports youth engagement and long-term water awareness
- Free educational workshops hosted at community centers, nonprofits, and local venues
- Tailored to local conditions, catchment systems, and water challenges
- 30-minute complimentary consultations at your home
- Practical, verbal guidance on system design, maintenance, and improvement
- An opportunity to introduce your system and ask informed questions
- Free access to How-To Videos, educational articles, and the “News You Need to Know” series
- Ongoing updates covering local and global water issues
- Education on best practices, professional standards, and credential verification
- Empowering homeowners to make informed decisions and demand quality work