Documents Library — Wichita Falls Water, NDMA & Potable Reuse

Records Library

Browse by subject

Records are organized by subject to make it easier to follow the project history, locate original documents and compare related records from different sources.

Water Reuse

Direct Potable Reuse

Engineering records, regulatory approvals, treatment information, testing documents and operational records from the 2014–2015 emergency DPR project.

Browse DPR records →

Water Reuse

Indirect Potable Reuse

Records concerning Wichita Falls' permanent indirect potable reuse system and the return of treated wastewater to Lake Arrowhead.

Browse IPR records →

Contaminants

NDMA Records

Laboratory results, monitoring data, correspondence, engineering discussions and other Wichita Falls records that specifically address NDMA.

Browse NDMA records →

Treatment

UV Treatment & Pilot Testing

Records concerning ultraviolet treatment, operating dose, treatment design, pilot testing and NDMA-related treatment evaluations.

Browse UV records →

Government

Regulatory Records

Approvals, correspondence, reports and other records involving the City of Wichita Falls, TCEQ, EPA and other government agencies.

Browse regulatory records →

Public Records

Records Requests

Public information requests, federal FOIA requests, agency responses and records produced through those requests.

Browse records requests →

Source Documents

Key documents

These twelve records trace the history of NDMA and potable reuse in Wichita Falls from the first federal detections through the records still outstanding today. Every one is linked to the original document. The full library of several hundred documents is below.

2009

Wichita Falls UCMR 2 NDMA Results

Federal monitoring detected NDMA in all fifteen Wichita Falls finished and distribution water samples collected in 2009, five years before potable reuse began. Results ranged from 2.3 to 36.1 ng/L.

Source: U.S. Environmental Protection Agency

View document →

Official EPA archive

1 Aug 2012

TCEQ Reuse Analyte Monitoring Recommendations

TCEQ’s water quality monitoring recommendations for direct and indirect reuse facilities. NDMA and NPYR are identified by EPA Method 521 as highly recommended for sampling.

Source: Texas Commission on Environmental Quality

Download PDF →

15 Feb 2013

TrojanUV Correspondence on NDMA and UV Oxidation

TrojanUV sends City staff UV oxidation case studies and NDMA information, and asks directly whether NDMA levels leaving the River Road Wastewater Treatment Plant have been examined.

Source: Project correspondence, obtained through public information request

Download PDF →

4 Mar 2013

Appendix K: 45-Day Verification Testing Protocol

Parameter table for the original DPR verification testing protocol, explicitly including NDMA and NPYR testing.

Source: City of Wichita Falls

Download PDF →

5 Sept 2013

TCEQ Enclosure A: Full-Scale Verification Testing Protocol

The verification testing protocol establishing minimum requirements for the direct potable reuse project before operation.

Source: Texas Commission on Environmental Quality

Download PDF →

5 Sept 2013

TCEQ Enclosure B: Monitoring and Reporting of Operating Conditions

The monitoring diagram mapping every required sampling point through the DPR system, from wastewater effluent through blending to finished water. No nitrosamine appears anywhere on it.

Source: Texas Commission on Environmental Quality

Download PDF →

20 May 2014

DPR Treatment Process and Testing Protocol

City document describing the treatment process, safety measures and testing protocol developed for the direct potable reuse project before water entered the distribution system.

Source: City of Wichita Falls

View document →

Hosted by the City

5 Aug 2014

TCEQ Enclosure G: Unregulated Contaminants of Concern

TCEQ again recommends quarterly NDMA and NPYR monitoring by Method 521, marked highly recommended for sampling. It was not required.

Source: Texas Commission on Environmental Quality

Download PDF →

2014

TCEQ Drinking Water Compliance Report

State compliance report documenting TCEQ’s conditional approval of the Wichita Falls direct potable reuse project in July 2014.

Source: Texas Commission on Environmental Quality

View document →

Official TCEQ archive

28 Dec 2015

Garver Draft Final Report: UV-AOP Pilot Testing

Draft final report from the WateReuse Texas funded pilot conducted by Garver Engineering at the Cypress Water Treatment Plant, evaluating filtration and oxidation options for Wichita Falls reverse-osmosis permeate.

Source: Garver Engineering, obtained through public information request

Download PDF →

2016

Garver Presentation: UV-AOP Findings

Presentation slides reporting that NDMA was the most prominent micropollutant found in Wichita Falls RO permeate samples, and was most efficiently mitigated by UV alone.

Source: Garver Engineering, WateReuse Texas

Download PDF →

26 June 2026

Eurofins Response Regarding 2015 Pilot Laboratory Reports

The laboratory confirms it still holds the 2015 Wichita Falls pilot reports but states they can be released only to the firm that submitted them. The underlying results have been requested and not obtained.

Source: Eurofins, correspondence

Download PDF →

Scientific Research

Research that provides context for the records

Scientific literature is maintained separately from the Wichita Falls record so the two remain easy to distinguish. The Research library covers NDMA formation, reverse osmosis, ultraviolet treatment, potable reuse, distribution systems and health and toxicology.

Explore Research →

Official Resources

Agencies and official references

These agencies maintain drinking-water records, analytical methods, regulatory information, local water-system information and environmental health resources relevant to this project.

Federal

U.S. Environmental Protection Agency

Federal resources for drinking-water monitoring, unregulated contaminants and laboratory methods used to measure nitrosamines including NDMA.

EPA Method 521 → UCMR 2 →

State Regulation

Texas Commission on Environmental Quality

Texas regulation and oversight of public drinking-water systems, including monitoring, compliance, approvals and drinking-water system information.

Public Drinking Water → 2014 Compliance Report →

Local Water System

City of Wichita Falls

Current information about Wichita Falls water sources, purification, treatment facilities, drinking-water reports and local water-system operations.

Water Source & Purification → Water Treatment →

Public Health

Texas Department of State Health Services

Environmental epidemiology, health assessment and toxicology resources used to evaluate environmental exposures and potential public-health concerns.

Environmental Surveillance → Health Assessment & Toxicology →

Document Archive

Review the source record directly.

The twelve documents highlighted above are a small part of the collected record. The full library holds 689 public records, correspondence, engineering materials, laboratory reports and regulatory documents covering Wichita Falls potable reuse, NDMA monitoring and treatment decisions, from 2003 to 2026.

Wherever possible, original source documents are provided so readers can review the record for themselves.

The library is searchable and filterable by subject. It is updated as records are received; how documents are sourced, handled and redacted is set out on the Methodology and Sources page.

Search All 689 Documents → Browse Key Documents → View the Timeline →

Source Documents

Document Library

Search and review the source records collected for this project. Documents are organized by the category assigned in the public records archive and open directly from the public R2 document repository.

Showing all 689 documents

July 3, 2003 PDF

Browse by subject

Direct Potable Reuse

Indirect Potable Reuse

NDMA Records

UV Treatment & Pilot Testing

Regulatory Records

Records Requests

Key documents

Wichita Falls UCMR 2 NDMA Results

TCEQ Reuse Analyte Monitoring Recommendations

TrojanUV Correspondence on NDMA and UV Oxidation

Appendix K: 45-Day Verification Testing Protocol

TCEQ Enclosure A: Full-Scale Verification Testing Protocol

TCEQ Enclosure B: Monitoring and Reporting of Operating Conditions

DPR Treatment Process and Testing Protocol

TCEQ Enclosure G: Unregulated Contaminants of Concern

TCEQ Drinking Water Compliance Report

Garver Draft Final Report: UV-AOP Pilot Testing

Garver Presentation: UV-AOP Findings

Eurofins Response Regarding 2015 Pilot Laboratory Reports

Research that provides context for the records

Agencies and official references

U.S. Environmental Protection Agency

Texas Commission on Environmental Quality

City of Wichita Falls

Texas Department of State Health Services

Review the source record directly.

Document Library

TCEQ IWUD Record Wastewater Reuse Exception Request Granted Letter

TCEQ 2004 Conditional Approval for Cypress SWTP Expansion Project

City Grandfathered Cryptosporidium Data Package

TCEQ Acceptance of Second Hf Membrane Wastewater Reuse Pilot Study

TCEQ Letter on Second Hf Membrane Wastewater Reuse Pilot Study

City of Wichita Falls Notification of Completion of Construction of the RO Membrane Plant

TCEQ Approved CT Study for Cypress RO Membrane Plant 3 3 Mgd MF RO

TCEQ Reclaimed Water Authorization for River Road WWTP Effluent Type

City TCEQ Surface Water Monthly Operating Report SWMOR Cypress 1961 Plant

City TCEQ Surface Water Monthly Operating Report SWMOR Cypress

City TCEQ SWMOR for Cypress Microfiltration R O Plant August

TCEQ Revised Contact Time CT Study Approval for Cypress 2010 Water

Biggs Mathews Cypress Water Treatment Plant CT Study Flow Diagram Pre DPR Oct

Biggs Mathews Biggs and Mathews Notification to TCEQ Proposing Chloramine Biocide

Cdm Smith Cdm Smith March 2012 Site Map of Proposed Wichita Falls Reuse System

City Multi Year 2000 2012 Narrative Summary of River Road WWTP Volatile

City CDM Strategy to Differentiate Wichita Falls IPR Proposal from

City Earlier Message in April 2012 Thread Differentiating Wichita Falls

TCEQ Conditional Approval of Chloramines Biocide Addition at Cypress

CDM Smith CDM Smith Letter to TCEQ Revising Wichita Falls Reclaim Water Project

CDM Smith CDM Smith Lake Arrowhead Discharge IPR Would Not Require the

Corlett Schreibers June 29 2012 Reaction to TCEQ Response Draft Guidelines

City TCEQ Surface Water Monthly Operating Report SWMOR Cypress 2010 TCEQ

CDM Smith Reaction to TCEQ's June 2012 Response on Reuse Project Schreiber

City Reuse Project Strategy After Aug 29 2012 TCEQ Call Earlier Message in

City Concept Paper for Emergency DPR of Wastewater

City Concept Paper for Emergency Reuse of Wastewater Effluent As a Source

TCEQ Fw Wichita Falls Concept Paper Nitrate Unit Correction Email

City Water Supply Alternatives Presentation January

City Appendix F Concept Paper for Emergency Reuse of Wastewater Effluent

City IPR DPR Reuse Options Cost Comparison Spreadsheet for March 19

City Council Presentation Wichita Falls Long Term Reuse Study March

City Draft Wichita Falls Long Term Reuse Study Council Presentation 3

City DPR Preliminary Engineering Report and Full Scale Verification Test

TCEQ Pir Production Oct 2 2025 May 10 2013 Preliminary Engineering

City Water Reuse Projects Presentation Covering

Biggs Mathews Partial Plan Set for Temporary DPR Conveyance Facilities Cwf 13

City DPR Preliminary Engineering Report Submittal to TCEQ May 2013 no Text

City DPR Preliminary Engineering Report Submittal to TCEQ May

Unknown Contract Documents Partial Plans for Construction of the Temporary

Biggs Mathews Temporary DPR Conveyance Facilities Cypress WTP Connection Detail and

Biggs Mathews Temporary Site Piping Modification Drawings Cypress WTP Sealed

Biggs Mathews City Response to Tceqs 1st Set of 13 Questions 6 18 13 on the

Biggs Mathews Cypress WTP Connection Detail Temporary DPR Conveyance Facilities

Biggs Mathews Response to TCEQ 1st Set of PER Questions Engineering Letter

Biggs Mathews River Road WWTP Process Schematic and Raw Effluent Pathogen Data

TCEQ Fw Transmittal of City Response to 1st Set of PER Questions Email

City Council Agenda Item Authorizing Temporary Water Reuse Conveyance

Biggs Mathews Drawings Submitted with Citys 2nd Response to TCEQ Questions Jul

Biggs Mathews Drawings Temporary DPR Treatment Facilities and Site Piping

City Appendix O CT Study Request Enclosure H1 Description Schematic T10

Unknown Backwash Procedure and Air Gap Isolation Plan for DPR Full Scale