# Septic Sizing Plumb — Tank & Drainfield Calc > Septic system sizing calculator for tank size and drain field area. (iPhone/iPad app by Rizvan Adzhoian.) - Source: https://appshunter.io/ios/app/septic-sizing-plumb/id6765784073 (this page in markdown: same URL + `.md`) - Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) - Category: Utilities, Business - Price: $0.99 with in-app purchases - Rating: 1.00/5 from 1 App Store ratings - Age rating: 17+ - Requires: iOS 13.0 · 33 MB - Languages: American English - Released: 2026-05-04 - Data updated: 2026-09-07 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/septic-sizing-plumb/id6765784073/reviews.md ## What is Septic Sizing Plumb? Septic System Sizing Calculator helps you calculate septic tank size and drain field area using the tank and absorption-field tables commonly adopted by state health departments and the private sewage disposal codes. Instantly determine required tank size based on occupancy and flow, then calculate drain field area using soil percolation rate. Support 5 soil types with application rates from sandy soil through clay. Works 100% offline on the job site. Useful for septic system design, permitting, and installation. FEATURES - Septic Tank Sizing: 1,000 gal through 3 bedrooms, 1,250 gal for 4, 1,500 gal for 5, +250 gal per additional bedroom (150 gal/bedroom/day design flow) - Daily Flow Estimation: Automatic calculation of design flow using standard residential plumbing fixture loads - Drain Field Area: application rate by percolation rate (1.2 / 0.8 / 0.6 / 0.4 gal per sq ft per day for 1-5 / 6-15 / 16-30 / 31-60 min per inch); slower than 60 min/in is flagged as not suitable for a standard field - 5 Soil Presets: gravel/coarse sand, sand, sandy loam, loam, and clay loam with typical percolation rates - Custom Percolation Rate: Override pre-set rates and enter your site-specific perc test results - Tank Size Options: Standard tank sizes from 1000-2000+ gallons with recommendations - System Capacity Verification: Check if existing tank meets IRC minimum requirements HOW IT WORKS 1. Enter number of bedrooms in the residence 2. View calculated daily design flow and IRC minimum tank size 3. Select soil type from perc test (sandy soil to clay) 4. App calculates required drain field area in square feet 5. Export sizing recommendation to PDF for permit application PERFECT FOR - Septic system installers and contractors - Plumbers designing and installing septic systems - Home builders sizing systems for new construction - Plumbing inspectors and health inspectors verifying system compliance - Plumbing apprentices preparing for master/journeyman exams - Environmental health specialists and site evaluators - Soil scientists with perc test data OPTIONAL PRO UPGRADE — $2.99 ONE-TIME IN-APP PURCHASE The following features require a separate one-time in-app purchase. They are not required to use the calculator: • Unlimited saved calculation history • PDF export of results • Dark theme • Ad-free experience STANDARDS & COMPLIANCE IRC (International Residential Code) Table P2602.1 Minimum Septic Tank Size Requirements, IRC Table P2602.2 Absorption Field Area Requirements, Standard residential design flow of 150 gal/bedroom/day, Soil percolation rate classifications and application rates per IRC Appendix P. PERFECT FOR - Septic system installers and contractors - Plumbers and drain installers - Home builders and builders' estimators - Plumbing and health inspectors - Site evaluators and engineers - Environmental health professionals OFFLINE & PRIVACY - Works 100% offline - calculate systems anywhere - No account required - instant access without signup - No data collection - all designs stored locally - No internet dependency Part of PlumbTools Suite - professional plumbing calculator tools for septic system design. Calculate tank and drain field sizes accurately, ensure IRC compliance, and speed up system permitting with accurate septic sizing calculations. ## Key features - Septic tank sizing by bedrooms - Daily flow estimation - Drain field area calculation by percolation rate - Support for 5 soil types - Custom percolation rate input - PDF export of results (Pro) - Offline functionality ## Pricing and in-app purchases Base price: $0.99. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Pro Unlock | $2.99 | one-time | ## Frequently asked questions about Septic Sizing Plumb ### What is the minimum tank size Septic Sizing Plumb calculates? Septic Sizing Plumb calculates minimum septic tank sizes starting from 1,000 gallons for up to 3 bedrooms. For 4 bedrooms, it calculates 1,250 gallons, and for 5 bedrooms, 1,500 gallons. Additional bedrooms add 250 gallons each. ### How does Septic Sizing Plumb calculate drain field area? The app calculates drain field area based on the soil percolation rate. It uses application rates per square foot per day for different percolation speeds, flagging rates slower than 60 minutes per inch as unsuitable for standard fields. ### Can I use Septic Sizing Plumb without an internet connection? Yes, Septic Sizing Plumb works 100% offline. This allows you to perform calculations directly on the job site without needing an internet connection. ### What soil types does Septic Sizing Plumb support? Septic Sizing Plumb supports 5 soil types, ranging from gravel/coarse sand and sand to sandy loam, loam, and clay loam. It includes typical percolation rates for these presets. ### What are the benefits of the Pro upgrade in Septic Sizing Plumb? The optional Pro upgrade for $2.99 offers unlimited saved calculation history, PDF export of results, a dark theme, and an ad-free experience. These features are not required for basic calculator use. ### Does Septic Sizing Plumb have ads? The base version of Septic Sizing Plumb contains advertisements. An ad-free experience is available as part of the optional Pro upgrade. ### What standards does Septic Sizing Plumb comply with? Septic Sizing Plumb complies with the International Residential Code (IRC) Tables P2602.1 and P2602.2 for minimum septic tank size and absorption field area requirements, respectively. It also uses a standard residential design flow of 150 gal/bedroom/day. ### Is Septic Sizing Plumb suitable for custom percolation tests? Yes, Septic Sizing Plumb allows you to override the pre-set soil rates. You can enter your site-specific custom percolation test results for more accurate drain field area calculations. ## Version history (last 3 releases) ### 1.0.5 — 2026-06-12 What's new: - Safety: percolation slower than 60 min/inch is flagged "not suitable for a standard absorption field" instead of silently sizing at the clay rate - Listing references corrected to the commonly adopted state/private-sewage tables ### 1.0.4 — 2026-05-18 What's new: - Updated metadata for clarity per App Store guidelines - Optional Pro upgrade is a separate one-time in-app purchase (not required for calculator features) ### 1.0.3 — 2026-05-04 No release notes. ## More apps by Rizvan Adzhoian - [Conduit Fill Calculator-NEC](https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849) - [Electrical Load Calc NEC](https://appshunter.io/ios/app/electrical-load-calc-nec/id6763250945) - [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943) - [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448) - [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724) - [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865) All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079 ## Related topics [septic](https://appshunter.io/ios/topics/septic) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*