{"id":376,"date":"2026-03-15T13:34:19","date_gmt":"2026-03-15T13:34:19","guid":{"rendered":"https:\/\/rpmwes.com\/blog\/?p=376"},"modified":"2026-07-03T02:48:11","modified_gmt":"2026-07-03T02:48:11","slug":"sewer-credit-application-documents","status":"publish","type":"post","link":"https:\/\/rpmwes.com\/blog\/sewer-credit-application-documents\/","title":{"rendered":"What Documents Do I Need for a Sewer Credit Application?"},"content":{"rendered":"

Quick Answer<\/strong><\/p>\n

A sewer credit application typically requires six documents: logged submeter readings from your makeup water and blowdown meters (most utilities want 60 to 90 days of continuous data), cooling tower specifications (manufacturer, model, rated tonnage), a piping diagram showing where submeters sit relative to the main meter, 12 months of recent water and sewer bills, meter calibration certificates proving accuracy within about plus or minus 2 percent, and the utility’s own application form. Missing or incomplete paperwork is the most common reason applications are delayed or denied, so gather everything before you submit. Requirements vary by city \u2014 call your utility for its specific form and data-period requirement before installing meters, since the meter type and logging format you choose should match what the utility will accept.<\/p>\n

A sewer credit<\/a> application is only as strong as its documentation. Missing or incomplete paperwork is the number-one reason applications get delayed or denied \u2014 and every month of delay is another month of full sewer charges on water that never reached the sewer. Here’s exactly what you need to prepare.<\/p>\n

The Standard Documentation Package<\/h2>\n

While specific requirements vary by utility, most sewer credit applications require the following documents. Gathering these before you start the application can shave weeks off your approval timeline.<\/p>\n

Submeter readings<\/strong> are the foundation of every application. You need logged data from both your makeup water meter (measuring water flowing into the cooling tower) and your blowdown meter (measuring water discharged from the tower to the sewer). Most utilities require 60 to 90 days of continuous readings, though some accept as few as 30 days. Digital meters that log automatically produce the cleanest, most convincing data sets.<\/p>\n

Cooling tower specifications<\/strong> help the utility verify that your evaporation claims are physically plausible. Include the manufacturer, model number, rated tonnage, design flow rate, and number of cells. If you have the original engineering submittal or cut sheet, include it \u2014 utilities appreciate documentation they can cross-reference.<\/p>\n

Building mechanical drawings<\/strong> showing the piping layout from the main water meter through the cooling tower system are often required. The utility wants to see where your submeters are installed relative to the main meter and confirm that no water uses are being double-counted. A simple single-line piping diagram is usually sufficient \u2014 you don’t need full architectural drawings.<\/p>\n

Recent water and sewer bills<\/strong> covering the past 12 months establish your baseline consumption and show the utility what your current charges look like. This helps them calculate the financial impact of your credit and verify that your submeter readings are proportional to your overall water use.<\/p>\n

Meter calibration certificates<\/strong> prove that your submeters are measuring accurately. Most utilities require meters to meet American Water Works Association (AWWA)<\/a> accuracy standards, typically within plus or minus 2 percent at normal flow rates. New meters come with manufacturer calibration certificates; existing meters may need field calibration by a certified technician.<\/p>\n

The utility’s application form<\/strong> is the final piece. Every utility has its own form \u2014 some are a single page, others are multi-page packages. Download the form early in the process so you know exactly what format the utility expects for your supporting documentation.<\/p>\n

What the Utility Is Really Looking For<\/h2>\n

Understanding the utility’s perspective helps you prepare a stronger application. They’re asking three fundamental questions: Is the claimed non-sewer water volume physically reasonable given the equipment installed? Is the metering data reliable and from properly calibrated instruments? And is there a clear, auditable trail from the main meter through the submeters that accounts for all water?<\/p>\n

The Department of Energy’s cooling tower management guidelines<\/a> provide the technical framework that many utilities reference when evaluating applications. Aligning your documentation with these standards strengthens your application.<\/p>\n

Common Documentation Mistakes<\/h2>\n

Avoid these pitfalls that frequently delay applications. Submitting only a few days of meter readings when the utility requires 60 or more days is the most common mistake. Providing estimated data instead of actual meter readings will almost always result in a denial. Forgetting to include calibration certificates \u2014 even if your meters are brand new \u2014 can stall an otherwise complete application. And submitting bills from a different account number than the one you’re applying for (common in multi-building portfolios) creates unnecessary confusion.<\/p>\n

For a broader view of how submetering fits into the sewer credit process, our submetering guide<\/a> covers everything from meter selection to installation. And if you’re still determining whether your building qualifies in the first place, start with our eligibility guide<\/a>.<\/p>\n

How to Organize Your Submission<\/h2>\n

How you package the documents matters almost as much as what’s in them. Utility reviewers process many applications, and the ones that get approved fastest read like a story: here’s the equipment, here’s how it’s metered, here’s the data, here’s the math. Assemble your package in that order, with a one-page cover summary listing the account number, service address, credit type requested, and the date range of the meter data.<\/p>\n

Label every data file and photo consistently. If you’re submitting spreadsheets of meter readings, include the meter serial number in the file name and a column showing the reading date, the raw register value, and the calculated daily volume. If the utility accepts electronic submissions, ask whether they prefer PDF summaries or raw CSV data \u2014 some review teams re-run the calculations themselves and want the raw numbers.<\/p>\n

Photograph everything. Clear photos of each installed submeter showing the register face and serial number, plus a wide shot showing the meter’s position in the piping, answer most of the questions an inspector would otherwise schedule a site visit to resolve.<\/p>\n

Timeline: When to Gather Each Document<\/h2>\n

Documentation works backward from the utility’s data requirement. If your utility wants 90 days of continuous readings, the earliest you can submit is 90 days after your meters are installed and logging \u2014 so get the slow items moving first.<\/p>\n

Before installation, request the application form and written program requirements from the utility, pull your last 12 months of bills from the utility’s online portal, and locate your cooling tower cut sheets. During the metering period, verify at least weekly that data is logging correctly; a two-day gap in the record can force you to restart the clock. In the final two weeks, order or locate calibration certificates, finalize the piping diagram, and complete the form itself.<\/p>\n

Plan for the full cycle to take four to six months from first phone call to first credited bill: roughly 2 to 4 weeks for meter procurement and installation, 60 to 90 days of data collection, and 30 to 60 days of utility review. Buildings that gather documents in parallel with data collection consistently hit the short end of that range.<\/p>\n

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Ready to Find Out What You Could Save?<\/h3>\n

RPM Water Equity Solutions helps commercial facilities recover money lost to sewer billing assumptions. If your building has cooling towers, you may be paying sewer charges on water that never reaches the sewer system.<\/p>\n

Request your free assessment today<\/a><\/strong> and find out how much you could recover.<\/p>\n<\/div>\n<\/div>\n

Let RPM Handle the Paperwork<\/h2>\n

Gathering documentation is the least exciting part of saving money on sewer charges \u2014 but it’s also the most important. RPM handles the entire documentation package as part of our service: meter specification, installation coordination, data collection, and application preparation. We know exactly what each utility requires and in what format, so nothing falls through the cracks.<\/p>\n