AquaMizer Case Study: How One Condominium Reduced Water Use by More Than 6.5 Million Gallons a Year

Following the installation of AquaMizer at a South Florida condominium in 2016, the property’s combined domestic-water consumption declined by approximately 24.6%. The analysis compares the final complete year before installation with the first three complete years afterward and includes all domestic water recorded through the property’s two incoming meters. Average annual consumption fell by approximately 8,738 CCF, equivalent to more than 6.5 million gallons per year. At current Miami-Dade water and wastewater usage rates, the same reduction would represent approximately $117,000 in annual utility savings.

The Problem: Water Loss From Leaking Toilets

A leaking toilet can waste water continuously without being noticed. As water escapes from the tank, a conventional fill valve may repeatedly replace it, allowing the cycle to continue for days or even weeks.

AquaMizer is a toilet retrofit system designed to interrupt that cycle. Instead of allowing a leaking tank to refill continuously, the system keeps the refill valve closed until the toilet is intentionally flushed again. This limits the amount of water that can be lost between uses and makes a leaking or malfunctioning toilet more noticeable.

In a large condominium, the potential impact can be substantial. A property may have hundreds of toilets, and even a relatively small number of persistent leaks can result in millions of gallons of unnecessary water consumption.

More information about the system is available on the AquaMizer website.

How Water Consumption Was Measured

The condominium received domestic water through two separately metered incoming lines. The lines merged downstream of the meters and supplied the same domestic-water system.

Because both lines served the same system, neither meter was evaluated independently. Total domestic-water consumption was calculated by adding the readings from both meters for each billing period:

Total domestic-water consumption = Meter A + Meter B

Most of the visible reduction following installation appeared on one of the two meters. The available utility records do not explain why the change was distributed unevenly between the two incoming lines.

No valves were repositioned, and the incoming plumbing configuration was not changed as part of the AquaMizer installation. Because both lines supplied the same downstream system, the most reliable measure of actual conservation is their combined consumption.

Cooling-tower consumption and other separately metered water uses were not included in the analysis.

Establishing the Pre-Installation Baseline

AquaMizer was installed during 2016. The 2015 calendar year was therefore used as the final complete pre-installation year, while 2016 was treated as a transition year.

During 2015, the two domestic-water meters recorded:

This combined total became the pre-installation baseline.

The property’s utility bills separately identified water consumption, wastewater usage, fixed sewer-service fees, stormwater charges and other account items. This made it possible to distinguish usage-related savings from charges that would continue regardless of consumption.

Water Consumption After Installation

The first three complete post-installation years produced the following combined results:

Average annual consumption declined from 35,456 CCF before installation to approximately 26,718 CCF during the three complete post-installation years.

That represents an average annual reduction of approximately:

35,456 CCF − 26,718 CCF = 8,738 CCF

The percentage reduction was approximately:

8,738 ÷ 35,456 = 24.6%

The consistency of the results is important. Every complete post-installation year remained substantially below the 2015 baseline, with combined annual consumption ranging from approximately 26,100 to 27,300 CCF.

The result therefore does not depend on one unusually low month or one isolated year.

More Than 6.5 Million Gallons Conserved Annually

One CCF represents 100 cubic feet of water, or approximately 748 gallons.

Converting the average annual reduction into gallons:

8,738 CCF × 748 gallons = approximately 6,536,000 gallons

The measured reduction was therefore equivalent to approximately:

6.54 million gallons of water per year

That equals approximately:

• 545,000 gallons per month
• 17,900 gallons per day

What the Savings Were Worth at 2015 Rates

The property’s 2015 utility bills separated water charges, wastewater-usage charges, fixed sewer-service fees and stormwater charges.

Using the variable water and wastewater charges documented in a complete 2015 billing period, the combined usage-related cost was approximately $3.71 per CCF.

Fixed sewer-service fees, stormwater charges and other fixed account charges were excluded because they would not have declined when water consumption declined.

Applying the documented annual reduction to the 2015 variable rate:

8,738 CCF × approximately $3.71 per CCF = approximately $32,500

The reduction therefore represented approximately:

$32,500 per year in water and wastewater savings at 2015 rates

What the Same Savings Would Be Worth Today

Miami-Dade classifies a residential property with three or more units served through a common meter as a multi-family dwelling.

Under Miami-Dade’s 2025–2026 rate schedule, effective October 1, 2025, the applicable usage rates are:

Applying those rates to the documented average annual reduction produces the following estimate:

At current Miami-Dade rates, the same reduction would therefore represent approximately:

$117,000 in annual water and wastewater savings

This estimate includes only usage-based water and wastewater charges that decline when consumption declines.

It excludes fixed meter charges, fixed wastewater facility charges, stormwater charges and other account charges that would generally continue regardless of water use. It also excludes possible taxes, surcharges or other assessments.

The current-dollar figure should therefore be understood as an estimate based on Miami-Dade’s published water and wastewater usage rates, rather than a projection of the property’s exact future bill.

Results at a Glance

Conclusion

The property’s utility records show a substantial and sustained decline in combined domestic-water consumption following the AquaMizer installation.

Using the final complete year before installation as the baseline and averaging the first three complete years afterward:

• Annual domestic-water consumption declined by approximately 8,738 CCF
• The reduction equaled approximately 6.54 million gallons
• Average consumption declined by approximately 24.6%
• Estimated savings were approximately $32,500 annually at 2015 rates
• The same reduction would be worth approximately $117,000 annually at current Miami-Dade rates

The results demonstrate how preventing toilets from continuously refilling after a leak can produce significant and lasting savings across a large residential property.

Methodology and Limitations

This independent case study is based on historical utility-meter readings and billing records from a South Florida condominium.

Domestic-water consumption was calculated by combining readings from the property’s two incoming meters. The 2015 calendar year was used as the pre-installation baseline. AquaMizer was installed during 2016, which was excluded as a transition year. Post-installation consumption was based on the average of the complete 2017, 2018 and 2019 calendar years.

The analysis does not adjust for possible changes in occupancy, resident behavior, renovations or other operating conditions.

Historical savings were estimated using the usage-related water and wastewater charges documented in a 2015 utility bill. Current-dollar savings were estimated using Miami-Dade’s published 2025–2026 multi-family water and wastewater usage rates. Fixed and unrelated charges were excluded.

Disclosure

This case study was prepared independently. The author is not affiliated with, employed by or compensated by AquaMizer, Inc. The link to the manufacturer’s website is provided for informational purposes only.