PROPOSED REVISIONS A R E V I E W O F T H E L O N G T E R M R E - - PowerPoint PPT Presentation

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Feb 11, 2024 240 likes •400 views

LEAD AND COPPER RULE PROPOSED REVISIONS A R E V I E W O F T H E L O N G T E R M R E V I S I O N S P R O P O S E D B Y T H E N A T I O N A L D R I N K I N G W A T E R A D V I S O R Y C O U N C I L THERE IS NO SAFE LEVEL OF LEAD

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A R E V I E W O F T H E L O N G T E R M R E V I S I O N S P R O P O S E D B Y T H E N A T I O N A L D R I N K I N G W A T E R A D V I S O R Y C O U N C I L

LEAD AND COPPER RULE PROPOSED REVISIONS

SLIDE 2

THERE IS NO SAFE LEVEL OF LEAD

0.015 MG/L IS BASED ON FEASIBILITY

SLIDE 3

HISTORY OF LEAD REGULATION

SLIDE 4

BACKGROUND

LCR is a treatment technique rule
Requires actions to be taken to minimize lead and copper

in drinking water

Small/medium systems (Pop. <50,000) must take

specific actions if the action level is exceeded (Lead 0.015mg/L, Copper 1.3mg/L)

Large systems (Pop. >50,000) must minimize

corrosivity of the water prior to an exceedance

Newly serving 50,000 must also meet this requirement

SLIDE 5

LCR PROPOSED CHANGES

Lead sampling protocols
Increased corrosion control treatment
Lead material removal
Household action level
Separate copper rule

SLIDE 6

LEAD RULE PROPOSED CHANGES

Source: 2015 LCRWG Final Report

SLIDE 7

SAMPLING

Problems:
Finding locations and participants can be difficult
Inconsistent sampling from customers
Results vary based on lead source in home
Sampling infrequent and in relatively few homes
Proposed changes
Customer initiated tap sampling through targeted outreach
Increased focus on maintaining water quality conditions
New tiering criteria

SLIDE 8

CORROSION CONTROL

Problems:
Treatment interactions
Difficulty maintaining throughout distribution
Improved science without guidance
Proposed changes:
System specific water quality parameters
New guidance provided based on advancing science
Increased WQP monitoring
Any treatment or source change requires re-evaluation of

corrosion control

SLIDE 9

LEAD SERVICE LINE REPLACEMENT

Problems:
Partial replacement
Only focuses on LSL while goosenecks and pigtails may be a

similar risk

Proposed changes:
Remove all lead service

lines and lead components over 30 year period

Shared responsibility

SLIDE 10

HOUSEHOLD ACTION LEVEL

Problems:
Consumer notice is insufficient
Potential violation of section 1431 due to “imminent and

substantial endangerment to the health of persons”

Proposed changes:
Set HAL based on CDC recommendations
Notify residents and local health departments

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COPPER RULE PROPOSED CHANGES

Problems:
Highest risk sites different than lead
Lack of public education
Proposed changes:
Remove in-home sampling
Monitoring based on water corrosivity to

copper

Non-aggressive water
Continue to demonstrate
Aggressive water
Public education requirement
Mitigate risk

Source: 2015 LCRWG Final Report

SLIDE 12

COPPER CORROSION

Low pH and high alkalinity most corrosive to copper

LCRWG defined corrosive conditions – pH and alkalinity

Source: Journal AWWA April 2016 Roth et al.

LCRWG defined corrosive conditions – PO4 and alkalinity

SLIDE 13

PREPARATION TIPS

Materials Evaluation Recruit Customers Address Copper Corrosion

SLIDE 14

REMINDERS FOR CURRENT LCR

Highest risk sites
No “pre-flushing”
Aerators on
Wide-mouth bottles and fill as you would a drinking

glass

Consumer notice and certification to the State is

required

Sample early in the monitoring period

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THANK YOU

M E G A N L A R S O N I D A H O D E P A R T M E N T O F E N V I R O N M E N T A L Q U A L I T Y M E G A N . L A R S O N @ D E Q . I D A H O . G O V