Dallas mandates robust, code-driven water efficiency documentation on residential permit plans under the Dallas Green Building Ordinance (DGBO), integrating requirements from the 2021 codes and Dallas-specific amendments spanning fixture selection, irrigation, alternative water reuse, hot water systems, and stormwater management. Plan reviewers routinely redline ambiguous schedules, missing details, or noncompliant annotations-as mandated by regional and state law-demanding rigor and consistency from architectural drafters at every drawing sheet, schedule, and detail bubble.

Indoor Water Fixture Schedules and Compliance Annotations on Dallas Residential Plumbing Plans

Detailing GPM/GPF Values, WaterSense Certification, and City Amendments

Residential plumbing plans in Dallas must explicitly document fixture flow rates and certifications to meet both the adopted 2021 International Plumbing Code (IPC) and stringent local amendments (Dallas City Code Chapter 54). These regulations enforce the intent and specifics of DGBO water efficiency provisions for indoor use on every permit set. Schedules and legends must display for each specified and existing fixture:

  • Flow Rates: Maximum 1.5 gallons per minute (GPM) for lavatory faucets, 2.0 GPM for showerheads, 1.28 gallons per flush (GPF) for water closets-aligning with federally recognized WaterSense standards and the DGBO's baseline. Example schedule notation:

PLUMBING FIXTURE SCHEDULE
Lavatory 1 - Location: Master Bath - Flow: 1.2 GPM - WaterSense: Yes (Cert. #CAT123456)
Toilet 1 - Location: Powder Room - Flow: 1.0 GPF - WaterSense: Yes (Cert. #ABC789012)

  • WaterSense Certification: WaterSense compliance must be marked by fixture, using notation such as “WS” or “WaterSense Certified” in the schedule. Plan notes should read: “All lavatories, showerheads, and water closets to be WaterSense certified per DGBO Tier 2.”

The Dallas Plumbing Code further amends the 2021 IPC to mandate backflow prevention at water service entry (see Dallas City Code Chapter 54-161(b)), and restricts fixture types and connected flow devices as seen in Section 606 and Appendix E.

Code Call-Outs and Dimensioning in Drawing Sets

On the plumbing plans (typically P-sheets), each fixture symbol should be cross-referenced to the fixture schedule by a unique tag (e.g., LAV-1, WC-1). Placement dimensions, clearances, riser heights, and installation details must comply with the IPC and manufacturer literature. Notations to use include:

  • “Lavatory faucet: 1.2 GPM max, WaterSense labeled, mounted at 34" AFF (+/- 1"), clear space per IPC Table 405.3.1.”
  • “Shower valve: 2.0 GPM fixed head, IPC Section 604.4, Tier 2 DGBO compliance.”
  • “Water closet: 1.0 GPF, WaterSense, ADA clearance where applicable per Dallas Amendments and 2021 IPC.”

Fixture schedule tables should be placed on the main plumbing sheet (often P1.1 or P2.1) or in a separate schedule sheet, with clear cross-references from plan callouts. Annotations must note which fixtures are to be low-flow/WaterSense. Enlarged detail bubbles (A/P3.2, WC Install) are recommended where installation is atypical, ADA, or part of an alternate water reuse scheme.

Typical Plan-Review Redlines and Solutions

  • Missing or ambiguous fixture schedules: Plans are redlined with “Provide fixture schedule listing GPF/GPM and certification for each fixture.” Address with comprehensive schedules and clear sheet references.
  • Unverified WaterSense: Noted with “Fixtures indicated on plan are not identified as WaterSense certified. Revise per DGBO.” Always state certificate numbers or add a general note: “See manufacturer cut sheets for WaterSense certification.”
  • Improper dimensioning: Dallas reviewers expect all plumbing and rough-in heights dimensioned from FFE or AFF, with explicit callout to code section where deviations are allowed.

Citations: DFW Green Code, Dallas City Hall Plumbing

DGBO-Compliant Landscape Irrigation Documentation on Site Plans

Specifying Smart Controllers, Drip Zones, Backflow Prevention, and DGBO Water Budgets

All new irrigation systems in Dallas, for compliance under DGBO and the city’s local code based on 2021 IRC/IBC and Dallas Plumbing Code Appendix J, must be meticulously documented on landscape (L-series) and civil sheets. Required elements include:

  • Smart Controllers: All new systems must specify an EPA WaterSense-labeled irrigation controller (per DGBO and Texas Administrative Code, 30 TAC 344.62). Annotation example: “Provide Hunter Pro-HC controller (WaterSense), WiFi enabled, with soil moisture sensor relay and rain shutoff.” Include manufacturer/model/type in a schedule.
  • Drip Zone Layouts: All beds, shrubs, and perennials (non-turf areas) should be designated on plan as isolated drip irrigation zones with callout: “Drip Zone D1: 0.6 GPH inline emitters, 12" spacing, pressure compensating, serving landscape beds along North lot line.” Zones must be called out by type and location per Dallas Plumbing Code G104.6.
  • Backflow Prevention Assemblies: Reduced Pressure Zone (RPZ) assemblies are specified on all residences where chemigation, graywater, or alternate sources exist (per Appendix J of Dallas Plumbing Code). An explicit callout is necessary: “Install RPZ (Wilkins 975XL2, 1") 12" min. above grade, in valve box, testable per Texas law.” Schematic detail is often assigned the same sheet number across all projects for consistency, e.g.: “See detail 2/L2.2: RPZ Installation.”

A master valve is always required post-RPZ on irrigation main per Dallas G104.8. Plans missing this are frequently returned with “Show master valve and location. City of Dallas Irrigation code Section G104.8.”

Water Budget Calculations and Zoning Annotations

Dallas enforces lot coverage limits by zoning-Single-Family 6,000 (SF-6), for example, typically restricts the impervious area to 45% of lot size, but refer to Dallas Landscape and Tree Manual for up-to-date figures. The irrigation plan must demonstrate:

  • Area Served: Each irrigation zone's area in SF or acres.
  • Plant Type/ET Rates: Note “Turf Zone Z1: Warm season turfgrasses, ETo = 45" per year, adjusted by microclimate.”
  • System Application Rate: Each zone’s GPM, precipitation rate, and run time-matched to Texas ET calculations (TCEQ protocols).
  • Compliance Statement: “System water budget does not exceed maximum allowance per DGBO and Dallas Development Code for district SF-6.”

Callout conventions on L-sheets require:

  • Title block: Project address, legal lot, zoning, license irrigator’s stamp.
  • North arrow, scale bar, legible zone/valve/controller symbols matching a legend-legend must be complete; incomplete legends routinely redlined: “All symbols must be defined in legend.”
  • System schedule: Example: “Valve V1: 1” PVC, Q=12.5 GPM, Turf; V2: 3/4” PVC, Q=4.5 GPM, Drip”

Details, Dimensions, and Material Specs

  • Piping: Schedule 40 PVC, solvent-welded, sized per hydraulic calculation (3/4”-2”). Pressure rating min. 180 psi, depth min. 12” for turf/mainline. Spray head lateral lines must be isolated.
  • Zone Precipitation Rate Uniformity: All devices in a given valve zone must irrigate at the same precipitation rate (Code G104.6), and spray devices may not water any impervious surface (G104.7).
  • Emitter specs: Drip 0.6-2.0 GPH; spray 0.4-1.1 in/hr. All called out by manufacturer/model, see “Drip emitter: Rain Bird XF, 0.9 GPH, PC.”
  • Backflow device: Drawn in plan with leader to enlarged detail. Schedule and cross-reference all assemblies for testability and compliance with Texas water laws-notes must read: “Test RPZ on installation and annually per city code.”

Redline example: “Missing backflow prevention assembly detail. Provide valve box, type, and location callout per plan legend.” Failure to denote head-to-head coverage, or failure to separate hydrozone per plant type, also commonly redlined.

Citations: Dallas Code Amendments, TCEQ Checklist

Drawing DGBO-Compliant Graywater and Rainwater System Schematics

Plumbing Risers, Pipe Marking, and Sheet Details

Graywater and rainwater reuse systems, as encouraged by DGBO and regulated by Dallas Plumbing Code Chapters 15 & 16, must be fully schematicized and dimensioned on P-series or specialty sheets, with distinct color-coding, labeling, and code call-outs for non-potable lines and equipment.

  • Plumbing risers must show all non-potable lines in purple (Pantone #512). Plan and riser diagrams must annotate these lines: “NON-POTABLE WATER” at 10' max. intervals per Chapter 16, Section 1602.1.1. Use legend symbol: PPL-P = Purple, non-potable water line.
  • All pipe materials must conform to ANSI/NSF Standard 61 and show the NSF-pw stamp on isometric details (typically ¾"-2"): Material note: “PVC, Schedule 40, purple pigment, pressure-rating 150 psi min., to ANSI/NSF 61/14.”

Non-Potable Signage, Storage Tanks, and Cross-Connection Control

  • Signs at room entrances using non-potable water must read: “TO CONSERVE WATER, THIS BUILDING USES NONPOTABLE WATER TO FLUSH TOILETS AND URINALS”-white on purple, min. 8" x 8", letters 0.5" high. Sheet bubble: “SEE DETAIL 4/P6.2: NON-POTABLE SIGNAGE.”
  • Equipment room sign for water reuse: “CAUTION: NONPOTABLE WATER, DO NOT DRINK, DO NOT CONNECT TO DRINKING WATER SYSTEM.”
  • Storage tank callout example: “1,200 gal. poly tank, 65" dia., 60" H, non-potable label both sides, air-gap overflow, vented per Section 1506.3, access hatch lockable.” Tank plans must reference elevation and plan views: “Tank pad, 6” slab, locate per C1.3, see 5/P6.3 for section.”

Cross-connection control is strictly enforced: All potable-to-nonpotable connections require a testable RPZ (Wilkins 975XL 1.5", min. 12” AFF) with air gap device per Section 1504.3 and Dallas City Code Chapter 54-161(a). Common plan redline: “Show and label all required RPZ assemblies and air gaps on riser diagrams per code.”

Referencing Code on Drawings and Details

Details must call out relevant section numbers: “All non-potable systems installed per Dallas Plumbing Code Ch. 15 (Graywater) and Ch. 16 (Nonpotable), with signage, pipe marking, and tank requirements per Sections 1602 and 1503.” Where required, cite manufacturer cut sheets for specialty components.

Citations: Dallas City Code, Texas Distribution & Tanks

Documenting High-Efficiency Hot Water Systems for DGBO

UEF/Energy Factor Specifications and Code Call-Outs

Hot water system documentation in Dallas, per DGBO and the 2021 Dallas Energy Conservation Code (based on the 2021 IECC), must clearly specify water heater Uniform Energy Factor (UEF) or Energy Factor (EF) in schedules and mechanical/plumbing equipment lists. Example callout in equipment schedule:

WATER HEATER SCHEDULE
WH-1 - Navien NPE-240A2, Tankless Gas, UEF = 0.95, 199k BTU/h, NGBS/ WaterSense listed
WH-2 - Rheem XE40M06ST45U1, 40 gal. electric, UEF = 0.93, AHRI listed

General notes should state: “All water heaters to meet or exceed IECC/ DGBO minimum UEF/EF as required by Dallas Energy Code Section R403.5.3 and C404.” All equipment and efficiency annotation must appear clearly in schedule, plan callout, and mechanical specification sheet, and be cross-referenced to Detail 1/M6.1 or similar for installation schematics.

Hot Water Pipe Insulation and Recirculation System Schematics

  • Pipe Insulation: The 2021 IECC Section C404.5 mandates “All hot water piping (≥¾") to be insulated w/ 1” min. closed-cell, R-value per Dallas Energy Code and details in 2021 IECC Table C403.4.1. Schedule type, thickness, and manufacturer in the mechanical spec: “Insulate all HW pipes above slab with 1” Armaflex, R-6.5 min., tested per ASTM C547, per IECC C404.5.”
  • Recirculation Systems: Demand-controlled systems are shown in dedicated isometrics, with controller/actuator (e.g., Grundfos Comfort PM, Taco SmartPlug) and temperature sensor location bubbles. Plan note: “Provide timer and demand sensor at all remote HW locations per Dallas Energy Code Sec. R403.5.1, demand recirc.” Detail convention: color-code the recirc loop and call out all return/branch points, pump size/model, and control locations.

Common plan redlines:

  • “Insulation required on all hot water lines per IECC. Show on plan and detail in schedule.”
  • “Provide UEF or EF efficiency rating for all water heaters in equipment schedule.”
  • “Show location and type of demand-control recirculation pump and controller per code.”

All details should reference relevant code (2021 IECC R403/C404; 2021 IPC 607.2; 2021 IMC Section 1004, 1005). Use recurring detail numbers (“see 3/P7.1: Recirculation Loop Isometric w/ Sensor”) to standardize across sets.

Citations: Dallas Building Inspection, NCTCOG Amendments

Documenting Permeable Paving and Stormwater Features on Residential Site Plans

Material Specifications and Plan Callouts for Permeable Paving

Permeable paving-mandated and incentivized by DGBO for stormwater management and DGBO Tier 2 point compliance-must be documented with material specs, cross-section details, and explicit coverage calculations, especially in zoning districts with tight impervious cover restrictions.

  • Specs for Concrete Pavers: ASTM C936/936M compliance; specify comp. strength ≥8,000 psi, max. absorption 5%. Plan note: “Permeable paver: Belgard Urbana, 3-1/8" thick, ASTM C936, 6” open-graded aggregate base, 1” bedding, joints filled with #8 stone.”
  • Porous Asphalt: Section detail showing 4” thick open-graded mix over 6” aggregate reservoir, geotextile below. Schedule all courses, aggregates, and thicknesses in section callout (e.g., “See Detail 1/C5.1”).

Plans must include section bubbles and profiles with labeled layers, dimensions, and slopes. For example, “Permeable paving cross-section: 3-1/8” paver, 1” bedding sand, 6” #57 drainage rock, 12” subgrade compacted to 95% proctor, slope 1.5% to rain garden.”

Rain Gardens and Bioretention Cross-Sections

  • Ponding and Media: Callout: “Rain garden: 6-12” ponding, 24” engineered soil (75% sand, 15% compost, 10% topsoil), 6” drainage layer w/ 4” perforated HDPE underdrain (ASTM F405), vented flow outlet.”
  • Plan schedules should list area (SF), storage depth, and plant palette-cross-reference to city’s approved native plant list.

Impervious Cover Calculations and Zoning Notes

  • Impervious Cover: Calculation table must be included on site/C sheets-often C1.0 or L1.0. Example:

IMPERVIOUS COVER CALCULATION
Total lot area: 8,500 SF
Building footprint: 2,400 SF
Driveways/walks: 1,250 SF (includes 750 SF permeable paver at rear drive)
Patios: 350 SF
Total impervious: 3,650 SF (net: 2,900 SF when permeable area counted as per Dallas Stormwater Manual)
Percentage: 42.9% (SF-6 max allowed: 45%)

Plans missing explicit breakdowns will receive redlines: “Provide total and net impervious cover calculation. Delineate permeable from impervious on plan.”

Maintenance Notes and Dallas Stormwater Design Manual References

  • Permeable Paving Maintenance: “Vacuum sweep surface biannually, reset displaced pavers, replenish joint aggregate annually, per Dallas Stormwater Design Manual BMP 4.2.3.”
  • Rain Garden/Bioretention Maintenance: “Inspect bioretention vegetation quarterly, remove invasive species, clear debris from inlet/outlet, test underdrain function per Table 2.3-4.”

All stormwater documentation must cite the Dallas Stormwater Design Manual and Integrated Stormwater Management (iSWM) standards. Compliance notes: “Stormwater BMPs sized, installed, and maintained per Dallas Stormwater Design Manual Section 3.5.1 and DGBO requirements.”

Citations: Dallas Landscape and Tree Manual

Weaving Compliance into Construction Documents: From Redlines to the Job Site

Consistent drawing conventions enable clear code call-outs, expedite plan review, and reduce delays in Dallas permit workflows. Every water efficiency feature-from the 1.1 GPF toilet to the rain garden and demand-controlled hot water loop-must be scheduled, labeled, dimensioned, detailed, and referenced to the precise Dallas adopted code section, local amendment, or city standard. Site plan sheets require North arrows, scales, and legends defining every valve, controller, permeable area, and restricted zone. Plumbing/MEP sheets necessitate accurate schedules, tagged fixtures, and efficiency call-outs cross-referenced to cut sheets and manufacturer documentation. Symbols and notes for backflow devices, purple non-potable piping, mandatory signage for alternate water systems, and insulated hot water lines must be both present and easy to interpret. Maintenance and compliance statements should appear on all relevant site, landscape, and civil drawings, following the Dallas Stormwater Design Manual and the Dallas Green Building Ordinance as code minimum.

Responding promptly to common Dallas plan-review redlines (“Show fixture flow rates”; “Indicate RPZ device type and location”; “Detach impervious calculation including permeable paver area”; “Add nonpotable water signage per Section 1602.2”) with detailed, code-cited documentation ensures a shorter resubmittal cycles and builds on-the-job clarity for builders and inspectors.

For residential drafters and design professionals, the marriage of drawing rigor, code literacy, and city-specific annotation strategies forms the backbone of watertight, DGBO-compliant permit plans that make Dallas’s water performance goals a reality from first plan sheet through final inspection.

Kingsway Drafting & Design delivers code-literate, construction-ready water efficiency documentation for every Dallas residential project phase.