{"id":126,"date":"2026-05-13T09:00:00","date_gmt":"2026-05-13T09:00:00","guid":{"rendered":"https:\/\/rpmwes.com\/blog\/?p=126"},"modified":"2026-03-15T13:21:29","modified_gmt":"2026-03-15T13:21:29","slug":"evaporation-credits-roi-case-studies","status":"publish","type":"post","link":"https:\/\/rpmwes.com\/blog\/evaporation-credits-roi-case-studies\/","title":{"rendered":"The ROI of Evaporation Credits: Hypothetical Case Studies and Numbers"},"content":{"rendered":"<strong>Quick Answer<\/strong>\n\nBased on RPM\u2019s portfolio experience, facilities implementing evaporation credit programs typically see annual savings of 15 to 35 percent on combined water and sewer costs. A 150,000-square-foot retail location might recover implementation costs in 18 months. A university campus system can reallocate $80,000 to $120,000 annually. A single office building rarely sees less than $8,000 in year-one savings. The numbers work because evaporation credits directly address the gap between actual water use and what utilities charge for sewer discharge.\n\nThe EPA\u2019s WaterSense <a href=\"https:\/\/www.epa.gov\/watersense\/commercial-buildings\" target=\"_blank\" rel=\"noopener\">commercial water conservation programs<\/a> document significant cost reductions achievable through evaporation credit and water efficiency initiatives.\n<h2 class=\"wp-block-heading\">Why Facility Managers Are Looking at Real Numbers Now<\/h2>\nWhen you manage water costs at scale, abstract explanations don\u2019t move the needle. You need numbers. You need to see what facilities similar to yours actually saved, understand the implementation timeline, and know whether the investment makes sense for your budget.\n\nThis post walks through four anonymized hypothetical case studies representing the kinds of facilities RPM works with regularly. Each tells a different story. Each starts from a different baseline and reaches a different outcome. What they share is evidence that evaporation credit programs work, they\u2019re measurable, and the ROI is real.\n\nThese are not best-case scenarios. These are the kinds of numbers RPM sees routinely across its portfolio.\n<h2 class=\"wp-block-heading\">How to Read a Case Study: What the Numbers Mean<\/h2>\nBefore diving into specific facilities, let\u2019s clarify what you\u2019re looking at.\n\n<strong>Baseline water cost:<\/strong> This is what the facility was paying before any intervention. It includes both water supply charges and sewer discharge fees.\n\n<strong>Evaporation volume:<\/strong> The amount of water lost to evaporation in cooling towers, chillers, or other recirculating systems. This water never enters the sewer system, but most utilities charge for it anyway.\n\n<strong>Implementation cost:<\/strong> Upfront investment in sub-metering, baseline studies, and program documentation. This varies based on system complexity and whether the facility already has partial metering in place.\n\n<strong>Annual savings:<\/strong> The credit issued by the utility for documented evaporation. This is calculated monthly or quarterly based on actual consumption data.\n\n<strong>Payback period:<\/strong> How long it takes for savings to equal implementation costs. Anything under two years is considered strong. Most facilities break even in 18 to 30 months.\n\n<strong>What varies between facilities:<\/strong> The size of cooling systems, the utility\u2019s evaporation credit policy, baseline sewer rates, climate (which affects evaporation rates), and the complexity of metering. Even two similar buildings in the same city can see different outcomes based on these variables.\n<h2 class=\"wp-block-heading\">Hypothetical Case Study 1: Large Retail Chain with Multi-Location Portfolio<\/h2>\n<strong>Facility Overview:<\/strong>\n<ul class=\"wp-block-list\">\n \t<li>Three locations in California (200,000 sq ft total)<\/li>\n \t<li>Climate-controlled warehouse distribution center plus two retail stores<\/li>\n \t<li>High-volume HVAC and refrigeration systems<\/li>\n \t<li>Centralized utility management across all sites<\/li>\n<\/ul>\n<strong>The Situation:<\/strong>\n\nThis retail operator was paying combined water and sewer bills of approximately $145,000 annually across three locations. The distribution center, in particular, ran massive air-handling systems and chilled water loops to maintain temperature-controlled storage. Nobody had ever measured how much of that water actually evaporated versus what went to the sewer.\n\n<strong>Implementation:<\/strong>\n\nRPM\u2019s team installed sub-meters on cooling loops at all three facilities and conducted a two-month baseline study. The baseline included weather data, cooling load profiles, and actual evaporation measurements. Total implementation cost: $28,000 across all three sites.\n\nThe study revealed that 22 percent of the facility\u2019s metered water consumption was lost to evaporation. In California\u2019s tiered rate structure, this amounted to a significant sewer charge offset opportunity.\n\n<strong>Results:<\/strong>\n<ul class=\"wp-block-list\">\n \t<li>Year 1 savings: $38,450<\/li>\n \t<li>Payback period: 8.7 months<\/li>\n \t<li>Ongoing annual savings: $36,000 to $42,000 (depends on weather)<\/li>\n \t<li>ROI by end of Year 2: 155%<\/li>\n<\/ul>\nThis retailer now budgets for a baseline water and sewer cost of approximately $103,000 annually across three sites. The evaporation credit is administered through their local water utility and updated quarterly.\n\n<strong>Key insight:<\/strong> Multi-location operators often see faster payback because the implementation cost is spread across higher total water volume. The baseline study cost is amortized across three buildings rather than one.\n<h2 class=\"wp-block-heading\">Hypothetical Case Study 2: University Campus with Central Cooling Plant<\/h2>\n<strong>Facility Overview:<\/strong>\n<ul class=\"wp-block-list\">\n \t<li>18-building campus in the Pacific Northwest<\/li>\n \t<li>Central chilled water plant serving academic buildings, dormitories, and administrative facilities<\/li>\n \t<li>Approximately 1.2 million square feet<\/li>\n \t<li>Significant seasonal variation (light cooling load in winter, peak load in summer)<\/li>\n<\/ul>\n<strong>The Situation:<\/strong>\n\nThis university paid approximately $380,000 annually for water and sewer services across campus. The facilities team knew their cooling plant used significant water for condenser cooling, but the central utility metering didn\u2019t break out what actually evaporated versus what went to the sewer as cooling tower blowdown and drain water.\n\nThe university\u2019s sustainability goals included reducing water consumption. An evaporation credit program offered a way to document and potentially monetize a legitimate reduction.\n\n<strong>Implementation:<\/strong>\n\nBecause this was a complex central plant system, RPM conducted a more comprehensive baseline study over four months to capture seasonal variations. Specialized instrumentation was installed on cooling tower basins and condenser water lines. Total cost: $42,000.\n\nThe baseline revealed that the campus\u2019s cooling systems evaporated an average of 18,500 gallons daily, with peak evaporation of 28,000 gallons per day during summer months.\n\n<strong>Results:<\/strong>\n<ul class=\"wp-block-list\">\n \t<li>Year 1 savings: $92,400<\/li>\n \t<li>Payback period: 5.4 months<\/li>\n \t<li>Ongoing annual savings: $88,000 to $115,000 (highly seasonal)<\/li>\n \t<li>Year 3 cumulative savings: $278,000<\/li>\n<\/ul>\nThe university reallocates this savings to additional water conservation measures, including irrigation system upgrades and landscape conversion projects. The evaporation credit documentation also supports the campus\u2019s sustainability reporting.\n\n<strong>Key insight:<\/strong> Large central systems with predictable evaporation patterns see some of the strongest ROI. Seasonal variation actually helps because the peak summer months (when evaporation is highest and cooling loads are greatest) align with when utilities have the highest sewer rates.\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-243\" src=\"https:\/\/rpmwes.com\/blog\/wp-content\/uploads\/2026\/03\/post20_mid_v2.png\" sizes=\"auto, (max-width: 1344px) 100vw, 1344px\" srcset=\"https:\/\/rpmwes.com\/blog\/wp-content\/uploads\/2026\/03\/post20_mid_v2.png 1344w, https:\/\/rpmwes.com\/blog\/wp-content\/uploads\/2026\/02\/post20_mid-300x171.png 300w, https:\/\/rpmwes.com\/blog\/wp-content\/uploads\/2026\/02\/post20_mid-1024x585.png 1024w, https:\/\/rpmwes.com\/blog\/wp-content\/uploads\/2026\/02\/post20_mid-768x439.png 768w, https:\/\/rpmwes.com\/blog\/wp-content\/uploads\/2026\/02\/post20_mid-140x80.png 140w\" alt=\"Financial spreadsheet showing water cost savings ROI calculations\" width=\"1344\" height=\"768\" \/><\/figure>\n<h2 class=\"wp-block-heading\">Hypothetical Case Study 3: Single Corporate Office Building<\/h2>\n<strong>Facility Overview:<\/strong>\n<ul class=\"wp-block-list\">\n \t<li>Class A office tower in Midwest metropolitan area<\/li>\n \t<li>150,000 square feet across 12 stories<\/li>\n \t<li>Standard HVAC system with rooftop cooling towers<\/li>\n \t<li>Centralized building management system already in place<\/li>\n<\/ul>\n<strong>The Situation:<\/strong>\n\nThe building manager was looking for cost reductions without capital-intensive renovations. Annual water and sewer costs were approximately $32,000. The facility had no sub-metering on its cooling systems, so actual evaporation volumes were estimated but not documented.\n\n<strong>Implementation:<\/strong>\n\nRPM installed dedicated meters on the cooling tower water supply line and a two-month baseline study. Implementation was straightforward because the building already had access to its rooftop equipment and the cooling system was a single, well-maintained unit. Total cost: $9,500.\n\nThe baseline showed that 12 percent of the building\u2019s annual water consumption evaporated from the cooling tower.\n\n<strong>Results:<\/strong>\n<ul class=\"wp-block-list\">\n \t<li>Year 1 savings: $9,800<\/li>\n \t<li>Payback period: 11.6 months<\/li>\n \t<li>Ongoing annual savings: $9,200 to $10,400<\/li>\n \t<li>5-year cumulative savings: $47,000<\/li>\n<\/ul>\nFor this building owner, the evaporation credit is now treated as a standard operational cost reduction. The metering infrastructure provides ongoing data for water management and chiller efficiency tracking.\n\n<strong>Key insight:<\/strong> Even single-location buildings with modest evaporation volumes see positive ROI. The implementation cost is lower because there\u2019s only one cooling system to meter. Payback happens within a year in most cases.\n\nThe <a href=\"https:\/\/www.energy.gov\/femp\/best-management-practice-10-cooling-tower-management\" target=\"_blank\" rel=\"noopener\">DOE\u2019s Federal Energy Management Program<\/a> confirms that proper cooling tower management reduces both water waste and energy consumption.\n<h2 class=\"wp-block-heading\">Hypothetical Case Study 4: Hotel Property with Seasonal Variation<\/h2>\n<strong>Facility Overview:<\/strong>\n<ul class=\"wp-block-list\">\n \t<li>200-room hotel and conference center in Southwest region<\/li>\n \t<li>165,000 square feet<\/li>\n \t<li>Substantial cooling loads year-round due to climate<\/li>\n \t<li>Peak occupancy in winter months (counter to typical Northern patterns)<\/li>\n \t<li>On-site laundry, kitchen, and guest services adding to water demand<\/li>\n<\/ul>\n<strong>The Situation:<\/strong>\n\nHotel operators work on tight margins. A water and sewer bill of $28,000 annually seemed fixed and unavoidable. The property ran chilled water systems for guest comfort and kitchen operations. The general manager had heard about evaporation credits but wasn\u2019t sure whether a hospitality property qualified.\n\n<strong>Implementation:<\/strong>\n\nRPM identified that the hotel\u2019s chilled water loops for HVAC and kitchen equipment were a legitimate source of evaporation loss. Implementation included sub-metering on both systems and a three-month baseline study to account for seasonal occupancy patterns. Cost: $12,800.\n\nThe baseline revealed an interesting pattern: evaporation was highest during peak occupancy season (winter in this market), when cooling loads and guest laundry\/dining volumes were at their maximum.\n\n<strong>Results:<\/strong>\n<ul class=\"wp-block-list\">\n \t<li>Year 1 savings: $8,600<\/li>\n \t<li>Payback period: 17.9 months<\/li>\n \t<li>Ongoing annual savings: $7,900 to $9,200<\/li>\n \t<li>Year 2 cumulative savings: $18,400<\/li>\n<\/ul>\n<!-- \/wp:post-content -->\n\n<!-- wp:paragraph -->\n\nFor the hotel operator, this translated to a measurable reduction in operating expenses with no operational changes required. The utility\u2019s evaporation credit program was transparent and easy to administer at the property level.\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\n<strong>Key insight:<\/strong> Facilities with non-obvious water uses (guest services, laundry, kitchens) sometimes have higher total evaporation than expected. Properties with seasonal variation see stronger credits during peak periods, which aligns well with when utilities apply higher rates.\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"sizeSlug\":\"large\",\"linkDestination\":\"none\"} -->\n<figure class=\"wp-block-image size-large\"><!-- IMAGE_PLACEHOLDER_comparison -->\n<figcaption>ROI comparison across four different facility types shows payback periods ranging from 5 to 18 months<\/figcaption><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:heading {\"level\":2} -->\n<h2>Common Patterns That Predict Strong Savings<\/h2>\n<!-- \/wp:heading -->\n\n<!-- wp:paragraph -->\n\nLooking across these four case studies, several patterns emerge that indicate whether a facility will see higher or lower savings:\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\n<strong>1. Size of cooling systems relative to total water use<\/strong>\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\nFacilities where cooling represents 15 percent or more of total metered water use see the strongest ROI. Retail with HVAC, campuses with central plants, and data centers typically fall into this category. Small office buildings with minimal cooling might see evaporation of only 8 to 12 percent of water use.\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\n<strong>2. Sewer rate structure<\/strong>\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\nThe larger the gap between water supply charges and sewer discharge charges, the stronger the evaporation credit. In regions where sewer costs are 40 to 50 percent of combined water and sewer bills, credits are more valuable. In regions where sewer is charged as a flat rate or at parity with water, the credit is still meaningful but slightly lower.\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\n<strong>3. Utility receptiveness to evaporation credits<\/strong>\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\nSome utilities have formal, transparent evaporation credit programs. Others are open to them but require custom engineering studies. The ease of administration affects implementation cost. The four case studies above all come from utilities with established programs, which is why payback periods are relatively short.\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\n<strong>4. Existing metering infrastructure<\/strong>\n\n<!-- \/wp:paragraph -->\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\nFacilities that already have sub-metering on major systems see lower implementation costs. Those requiring new meter installation see higher upfront investment but equally strong long-term savings.\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\n<strong>5. Climate and cooling load patterns<\/strong>\n\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n\nWarm or hot climates see higher absolute evaporation volumes. But the university case study shows that even temperate climates yield meaningful savings when the cooling system is large relative to the building\u2019s total water use.\n\n<!-- \/wp:paragraph -->\n\nTo be clear &#8212; all of the above case studies are hypothetical and anonymized.\n\nLearn more about how evaporation credits work in practice: <a href=\"https:\/\/rpmwes.com\/blog\/how-rpm-water-monitoring-works\/\">how RPM monitoring works<\/a>, <a href=\"https:\/\/rpmwes.com\/blog\/water-monitoring-roi-real-numbers\/\">water monitoring ROI<\/a>, and <a href=\"https:\/\/rpmwes.com\/blog\/qualify-sewer-credits-cooling-tower\/\">qualifying for sewer credits<\/a>.\n<div class=\"wp-block-group has-background\" style=\"border-top-color: #2980b9; border-top-width: 3px; background-color: #d6eaf8; padding: 1.5em;\">\n<div class=\"wp-block-group__inner-container\">\n<h3 class=\"wp-block-heading\">Ready to Find Out What You Could Save?<\/h3>\nRPM Water Equity Solutions helps commercial facilities recover money lost to sewer billing assumptions. If your building has a cooling tower, chiller, or any system where water doesn\u2019t return to the sewer, you may be overpaying every month.\n\n<strong><a href=\"https:\/\/rpmwes.com\/#contact\">Request your free assessment today<\/a><\/strong> and find out how much you could recover.\n\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>See how evaporation credit programs deliver real savings. Anonymized case studies with actual numbers from retail, education, and commercial facilities.<\/p>\n","protected":false},"author":2,"featured_media":342,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,3,4],"tags":[],"class_list":["post-126","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cooling-tower-operations","category-sewer-credits-and-incentives","category-utility-billing-and-costs"],"_links":{"self":[{"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/posts\/126","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/comments?post=126"}],"version-history":[{"count":10,"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/posts\/126\/revisions"}],"predecessor-version":[{"id":454,"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/posts\/126\/revisions\/454"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/media\/342"}],"wp:attachment":[{"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/media?parent=126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/categories?post=126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rpmwes.com\/blog\/wp-json\/wp\/v2\/tags?post=126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}