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Rocky Mountain Water: Rocky Mountain Water: Reuse it or Lose it!Reuse it or Lose it!
2006 Water Reuse Workshop2006 Water Reuse WorkshopColorado School of MinesColorado School of Mines
Golden, ColoradoGolden, ColoradoAugust 10, 2006August 10, 2006
Update on the Colorado Water Reuse Regulations
Wesley Carr, CDPHE
BackgroundBackground
o February 1998 – The Joint Reuse Committee - RMSAWWA/RMWEA suggested an approach to the Water Quality Control Commission (WQCC) for reuse of reclaimed domestic wastewater
o March 1998 – The WQCC requested a Water Quality Forum Subcommittee be convened to consider potential statutory changes to the Water Quality Control Act to address use of reclaimed domestic wastewater for landscape irrigation
BackgroundBackground
o Fall 1999 – the Forum subcommittee recommended the Water Quality Control Act be amended to provide the Commission authority to promulgate regulations for the oversight of reuse and provide the WQCD authority to implement a reuse program
BackgroundBackground
o March 2000 – General Assembly adopted changes to the Act providing the WQCC authority to establish regulations for reuse - except for uses related to drinking water
o July 1st, 2000 – Changes became effective
o Reuse subcommittee concurrently developed a control regulation modeled after the biosolids regulation
Reclaimed Water Control Reclaimed Water Control Regulation No 84Regulation No 84
o WQCC adopted the Reclaimed Domestic Wastewater Control Regulation in October 2000 (recently renamed - Reclaimed Water Control…)
o Initially, the scope was limited to the use of reclaimed water for landscape irrigation – excluding single-family residential areas
o Recent amendments added commercial, industrial and fire protection uses as well as resident-controlled (single-family) landscape irrigation.
PurposePurposeo Encourage the use of reclaimed water while protecting
public health and environment
o Make reuse permitting less cumbersome by eliminating previously required discharge permits - based on adequate demonstration of application at or below agronomic rates with respect to nutrients
o A “Notice of Authorization” is the implementing platform
o Treaters submit a Letter of Intent and for each user, a User Plan to Comply
Reuse Reuse Water Quality StandardsWater Quality Standards
o Mitigate public health risk by treating the water for pathogens: viruses, bacteria & protozoan
o Minimize the risk for gastrointestinal disorders for people casually exposed to reuse water used for surface irrigation of landscaping (and recently approved uses)
Reuse Reuse Water Quality StandardsWater Quality Standards
o Bacteria protection is achieved through imposing limits on E. coli – surrogate for bacteria pathogens
o Viral & protozoan protection is achieved through imposing limits on turbidity and TSS as appropriate
Reuse Reuse Water Quality StandardsWater Quality Standards
o Reclaimed water standards for uses requiring water (formerly “Restricted Use” water used in areas having a low potential for public contact) at a minimum shall receive:
o Secondary treatment and disinfection
o E. coli 126/100ml monthly geometric mean
235/100ml single sample maximum
o TSS 30 mg/L as a daily maximum
Category 1
Reuse Reuse Water Quality StandardsWater Quality Standards
o Reclaimed water standards for uses requiring water (formerly “Unrestricted Use” water used in areas with high potential for public contact) at a minimum shall receive:
o Secondary treatment, FILTRATION & disinfection
o E. coli 126/100ml monthly geometric mean
235/100ml single sample maximum
o Turbidity < 3 NTU daily average
< 5 NTU no more than 5% individual samples
Category 2
Reuse Reuse Water Quality StandardsWater Quality Standards
o Reclaimed water standards for uses requiring water (recently created for resident-controlled landscape irrigation and residential fire protection - higher potential for public contact and cross connections) at a minimum shall receive:
o Secondary treatment, filtration & disinfection
o E. coli N.D. in at least 75% of monthly samples
126/100ml single sample maximum
o Turbidity < 3 NTU daily average
< 5 NTU no more than 5% individual samples
Category 3
Reclaimed WaterReclaimed WaterApproved UsesApproved Uses
o Industrial Useso Cooling towerso Concrete Mixing and Washout o Dust Controlo Soil Compactiono Closed Loop Cooling Systems
o Landscape Irrigationo Restricted Access o Unrestricted Access o Resident-Controlled
o Commercial Uses o Mechanized Street Cleaningo Zoo Operations
o Fire Protectiono Nonresidential Fire Protection o Residential Fire Protection
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Treaters’ Letter of IntentTreaters’ Letter of Intento Treater Information – address, contact, phone, location. Etc.
o Info demonstrating the treaters’ ability to comply with the standardso treatment schematico proposed POC o Site application approval letter or evidence of a SA submittal
o Agronomic analysiso Nutrients e.g. N,P as applicableo Consumptive needs, BMPs, etc.
o Reuse System Management Plano Treatment & transmission systemso E/Oo Oversight of userso Ability to terminate service
o Certification Statements
o User Plan to Comply for each user
o Affirmation that use won’t materially injure water rights
o Where water is distributed for fire-protection: a map of where water will be distributed including a list of the associated fire protection districts and a letter of approval from each
User Plan to Comply User Plan to Comply All UsersAll Userso Use confined to authorized use area, operation or process
o Reclaimed water will not be used or sprayedo Occupied buildingso Domestic drinking water facilitieso Food is being prepared for human consumption
o Public Notification o Signageo E/O
o Piping, valves, outlets, etc. differentiated from potable or other piping systems
o Backflow prevention/cross-connection control methods
o System operated/maintained by authorized personnel
o Supplementing w/potable or other sources not allowed except through approved BF prevention device or air gap
o No impoundment within 100’ of domestic supplyo Unless linedo Other precautions approved by Division
o Worker education
o Other conditions as applicable
UPC Landscape IrrigationUPC Landscape Irrigationo User contact information/location
o Map/schematic showing use areas
o Description of BMPso Minimize ponding/runoffo ET rateso Rain shutoffo Inspections
o Where Category 1 water is requiredo Irrigation timeso Barriers
o Resident-controlled landscape irrigationo Treater responsible for all UPC information and shall act as the users’ legal
representative for purposes of certificationo Unless an HOA assumes responsibility
Category 1
o User information/location, etc
o Description of how water will be used
o Maps/Schematics
o Description of the potential for public contact associated with process or use
o Fate of water after it has been used e.g. discharged to sewer, stored, etc.
o BMPs to prevent contact, windblown, etc.
o Access restrictions or prevent contact with Category 1 water if applicable
o For fire protectiono Cross-connection control program information and BMPs
UPC – Commercial, Industrial & UPC – Commercial, Industrial & Fire ProtectionFire Protection
o Cooling Towerso Concrete Mixing & Washouto Dust Control, Soil Compaction & Mechanized Street Cleaningo Unrestricted Access/Resident Controlled Landscape Irrigationo Resident Controlled Landscape Irrigation
Additional ConditionsAdditional Conditions
o Update LOI/UPC/NOA Templateso Agronomic Rate Policyo Monitoring Policyo Additional Useso WWTF Process Water
Exemptions/Clarifications
Current/Future Current/Future Regulatory ConsiderationsRegulatory Considerations
Contact InformationContact Information
Wesley Carr, Environmental Protection SpecialistReuse Management Program
WQCD-P-B24300 Cherry Creek Dr. South
Denver, CO 80246-1530303-692-3613
