Rainwater Directory
Rainwater Installer Directory 4 Specialists Listed

Rainwater Harvesting Installers in San Marcos, Texas

Leading rainwater harvesting installers in San Marcos, Texas.

Legal Status & Regulations Legal / State Statutes Apply

Rainwater Collection Laws in Texas

Texas statutes address qualifying rainwater equipment sales-tax treatment and limits on certain property-association restrictions. Confirm current local plumbing and health requirements for the intended use.

Primary Citation: Tex. Tax Code § 151.355; Tex. Prop. Code § 202.007; HB 3391
Official source · reviewed 2026-09-14 →
50-State Legal Guide

Rainwater planning estimate

Collection potential and storage target

Estimate annual roof collection separately from the storage needed to cover your chosen daily demand and reserve period.

Collection formula: roof area × annual rainfall × 0.6233 × runoff efficiency. Storage target: daily demand × reserve days. This screening estimate does not model monthly droughts, tank overflow, local roof geometry, water quality, permits, or structural requirements. Rainfall source: NOAA National Centers for Environmental Information, U.S. Monthly Climate Normals, 1971-2000; verified 2026-09-14.

Official local programs and guidance

Texas Water Development Board rainwater harvesting guidance →

The Texas Water Development Board explains statewide tax and property-law provisions and publishes rainwater harvesting guidance. Statewide guidance; local plumbing, health, and building rules may add requirements.

Last reviewed 2026-09-14; Guidance resource, not a rebate promise.

Featured Installers in San Marcos

Provider details are shown with their evidence status. Verify licensing, insurance, and scope directly before hiring.

FLOW Rainwater Systems, LLC

1915 Mulberry Ct, San Marcos, TX 78666

Source review pending
Credentials reported by provider:

Authorized Pioneer® Water Tank dealer

Independent source verification pending.

Core Services

Water storage solutions Above-ground water tanks Pioneer® Water Tanks Rainwater harvesting systems Irrigation storage +7 more

Service Area: Central Texas, Texas hill country, Texas

Call (512) 270-8026 Visit Website
Need guidance? Read our 10-question contractor vetting checklist →

Texas Water Tanks

1600 Clovis Barker Rd #209, San Marcos, TX 78666

Source review pending
Credentials reported by provider:

NSF-61 Certified, BPA-free

Independent source verification pending.

Core Services

water storage tanks water storage systems tank liners AQUALINER® Fresh tank liner potable water storage +5 more
Call (512) 667-6451 Visit Website
Need guidance? Read our 10-question contractor vetting checklist →

Well Water Tanks

1600 Clovis Barker Rd #209, San Marcos, TX 78666

Source review pending
Credentials reported by provider:

NSF-61, BPA-free

Independent source verification pending.

Core Services

Deliver and install water storage solutions Water well tanks sales After-sales service Local dealer-direct network AQUALINER® Fresh tank liner +4 more
Call (877) 223-7784 Visit Website
Need guidance? Read our 10-question contractor vetting checklist →
E-E-A-T Hiring Advice

4 Essential Questions to Ask Before Hiring a Rainwater Installer

Rainwater harvesting involves structural engineering, filtration, and plumbing compliance. Before signing an installation contract, ensure your contractor addresses these key items:

  • Professional Credentials: Are they ARCSA Accredited Professionals (AP) or licensed plumbers certified in backflow prevention?
  • Pre-Filtration Sizing: What micron rating and first-flush diversion volume are they designing to prevent gutter sludge from reaching storage?
  • Tank Specifications: Are storage containers opaque, UV-stabilized, and certified to NSF/ANSI 61 if utilized for indoor or potable use?
  • Permits & Rebates: Will the contractor pull required municipal plumbing permits and submit utility rebate paperwork on your behalf?
Read our complete 10-question installer hiring guide & cost breakdown →