the safe drinking water act and the arsenic rule rajiv khera, p.e. arsenic in drinking water...
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The Safe Drinking Water Act and the Arsenic Rule
Rajiv Khera, P.E. Arsenic in Drinking Water
Discussion Panel - ITRC Fall MeetingOctober 27, 2004
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Overview SDWA regulatory framework Arsenic final rule Analysis of system impacts Implementation
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SDWA’s Approach to Public Health Protection
Standards & Treatment
User Information
Prevention
DistributionSystem
Multiple opportunities for health protection
from source to use
Multiple opportunities for health protection
from source to use
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SDWA Standards and Treatment
Occurrence Data
Human Exposure
Health Risks
CCLHealth Effects
Studies
Regulation?
Unregulated ContaminantMonitoring Regulation
NationalContaminantOccurrence
Database
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Roles and Responsibilities under SDWA
EPA sets health-based drinking water standards and provides
implementation guidance for States and systems
Primacy States implement standards and provide financial
and technical assistance to systems
Public water systems comply with water quality standards
Consumers benefit from standards and pay “pass-through”
compliance costs
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SDWA Regulates Public Water Systems Public Water Systems serve 15 connections
or 25 people for at least 60 days/year Three types of PWS
Community Water Systems (CWS’s) 15 connections or 25 people serving year-
round residents Non-Community Water Systems
Non Transient (NTNCWS) -- serves 25 of same persons for 6 months/yr
Transient (TNCWS)-- serves 25 persons/day for 60 days/yr
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Public Water Systems
Number of systems Population served (mil.)
88,000
20,000
54,000
CWS NTNCWS TNCWS
6.3
23.2
273.3
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SDWA Regulatory Process and the Arsenic Rule
1. Identify Maximum Contaminant Level Goal (MCLG): 0 ppb
3. Identify Best Available Technology (BAT)
4. List affordable compliance technologies for small systems
5. Establish monitoring, analytical methods, reporting, and record keeping requirements
2. Identify a MaximumContaminant Level (MCL): 10 ppb
Dobenefitsjustifycosts?
Identify“feasible”
MCL: 3 ppb3 ppb
Considerother MCLs
Done
No
Yes
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Arsenic Rule Benefit-Cost Analysis
MCL Option
Economic Analysis ($million)
Quantified Benefits Costs
3 $213.8 - $490.9 $792.1
5 $191.1 - $355.6 $471.7
10 $139.6 - $197.7 $205.6
20 $46.1 – $53.8 $76.5
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Arsenic Rule Cost Analysis Costs include:
Capital cost of new treatment O&M cost of new treatment Monitoring costs Administrative costs
“Bottom-up” analysis for national costs Estimate costs at facility level Monte-Carlo simulation to incorporate
uncertainty
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Arsenic Rule Cost AnalysisExpected Number
of Affected Systems
• national GW andSW arsenic
distributions• national GW and
SW systems
Expected SystemCapital and O&MTreatment Cost
• system flow • occurrence• # entry points
• treatment options
X =
National Cost Analysis
• total annual costs• average household
costs
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Arsenic Rule BAT and SSCT
Technology BAT SSCTMod. lime softening yes 1,2,3
Mod. coagulation/filtration yes 1,2,3
Anion exchange yes 1,2,3
Coag.-assisted microfiltration no 2,3
Oxidation-filtration (greensand)
yes 1,2,3
Activated alumina yes 1,2,3
Reverse osmosis yes 2,3
Electrodialysis reversal yes 2,3
POU reverse osmosis no 1,2,3
POU activated alumina no 1,2,31 = 25 to 500, 2=501 – 3,300, 3 = 3,301 – 10,000
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Systems Exceeding New MCL
74,000
3,000 1,100
0
20,000
40,000
60,000
80,000PWS Covered
CWS Exceeding
NTNCWS Exceeding
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CWS Impacts by System Size
30%
32%
11%
14%
7%6%
<100101-500501-1,0001,001-3,3003,301-10,00010,001-100,000>100,000
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Implementation Challenge
2,500 water systems
serving 25 to 500 people
Many have minimal or no
treatment
< 2 years to compliance
date++
=Implementation
Challenge
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Small System Impacts EPA identified multiple SSCT No variance technologies General variance Exemption
Extends compliance schedule Cannot pose unreasonable health risk
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SDWA Exemptions
Years
Any Size System Systems 25 - 3,300
3 Year Exemption 2 Year Extensions
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EPA’s Technical Assistance Treatment Technology Demonstration
Projects ($12 million budget) Under development/review
GFH (granulated ferric hydroxide) Media G2® (granular calcined diatomite) SORB 33TM (granular ferric oxide) AAFS-50 (activated alumina, iron modified)
For information contact Thomas Sorg: [email protected]