New York City has taken significant steps to protect residents from lead exposure, especially in drinking water. One of the most important regulations is Local Law 31, which focuses on identifying and managing lead risks in buildings. For property owners, managers, landlords, and co-op boards, understanding this law is essential for compliance, tenant safety, and long-term property value.
This guide explains what Local Law 31 is, who it affects, and how professional water testing helps meet the requirements.
What Is Local Law 31 in NYC?
Local Law 31 is part of New York City’s broader effort to reduce lead exposure in residential buildings. It requires certain property owners to test drinking water for lead and take action if unsafe levels are detected.
The law was created in response to increasing awareness of lead contamination risks in older buildings, especially those constructed before modern plumbing regulations.
Main purpose of the law
Local Law 31 aims to:
Protect residents from lead exposure
Identify contaminated water sources in buildings
Require testing and corrective action
Increase transparency about water safety
Ensure safer living conditions for families and children
Who Must Comply With Local Law 31?
Local Law 31 primarily applies to:
Buildings that:
Have multiple dwelling units
Were built before 1960
Or were built between 1960 and 1978 if lead plumbing is suspected
House children under the age of six
This includes:
Apartment buildings
Co-ops and condos
Rental properties
Mixed-use buildings with residential units
If a building falls under these categories, the owner is responsible for testing and maintaining safe water conditions.
Why Lead in Drinking Water Is a Serious Issue
Lead is a toxic metal that can enter drinking water through:
Lead service lines
Lead solder in plumbing joints
Brass fixtures containing lead
Corroded pipes in older buildings
Even small amounts of lead exposure can cause serious health problems.
Health risks associated with lead
In children:
Developmental delays
Learning disabilities
Behavioral issues
Nervous system damage
In adults:
High blood pressure
Kidney problems
Cardiovascular issues
Reproductive problems
Because lead is odorless, tasteless, and invisible, testing is the only reliable way to detect it in drinking water.
Local Law 31 Testing Requirements
Under Local Law 31, building owners must conduct lead testing of drinking water in apartments where a child under six resides.
Key requirements include:
Testing water from taps used for drinking or cooking
Using certified laboratories
Following proper sampling procedures
Providing results to tenants and relevant authorities
Taking corrective action if lead levels exceed limits
Lead Action Levels
The law follows established safety thresholds for lead in drinking water.
If test results show:
Below the action level: No immediate corrective action required, but documentation must be maintained.
Above the action level: Building owners must:
Notify tenants
Provide safe drinking water alternatives
Investigate the source of contamination
Complete required remediation
Common Sources of Lead in NYC Buildings
Even if city water meets safety standards, lead contamination often occurs inside buildings.
Typical sources include:
Lead service lines connecting the building to the main
Lead solder used in plumbing
Corroded copper pipes
Old faucets and fixtures
Aging internal plumbing systems
In many NYC buildings, especially pre-war structures, these materials may still be present.
How Professional Water Testing Helps With Compliance
Professional water testing is the most reliable way to comply with Local Law 31 and ensure accurate results.
The professional testing process
Property assessment
Review building age and plumbing materials
Identify high-risk areas
Sample collection
Water collected from designated taps
Sterile, approved sampling methods
Laboratory analysis
Certified lab tests for lead levels
Accurate, legally defensible results
Detailed reporting
Clear explanation of findings
Action recommendations if needed
Professional testing ensures:
Compliance with legal requirements
Reliable, documented results
Reduced liability for property owners
What Happens if Lead Is Found
If testing reveals elevated lead levels, building owners must take corrective action.
Common solutions include:
Replacing lead service lines
Installing certified point-of-use filters
Replacing old plumbing fixtures
Flushing and cleaning water systems
Upgrading internal piping
The specific solution depends on the contamination source.
Tenant Notification Requirements
Local Law 31 also emphasizes transparency.
Building owners must:
Provide test results to tenants
Inform residents of any elevated lead levels
Explain corrective actions
Provide safe water alternatives if needed
Clear communication helps maintain trust and ensures compliance with the law.
Penalties for Non-Compliance
Failing to comply with Local Law 31 can lead to:
City violations
Financial penalties
Legal liability
Tenant complaints or lawsuits
Reduced property value
Regular testing and proper documentation help avoid these risks.
Benefits of Complying With Local Law 31
Beyond legal requirements, compliance offers several advantages.
Key benefits
Protects resident health
Reduces liability risks
Improves tenant confidence
Maintains property value
Demonstrates responsible management
Supports long-term building safety
Proactive testing can also identify issues before they become serious problems.
How Often Should Testing Be Done?
While Local Law 31 focuses on specific scenarios, regular testing is recommended for all older buildings.
General guidelines
Annually for older properties
After plumbing repairs
When new tenants move in
If children under six reside in the unit
If water quality issues are suspected
Routine testing helps detect problems early and ensures ongoing compliance.
Choosing a Water Testing Provider
Not all testing services meet the standards required under Local Law 31.
Look for providers that offer:
Certified laboratory testing
Experience with NYC regulations
Proper sampling procedures
Clear, detailed reports
Compliance documentation
Local expertise
Working with experienced specialists ensures accurate results and smoother compliance.
Frequently Asked Questions
What buildings are affected by Local Law 31?
Primarily multi-unit residential buildings built before 1960, or those built before 1978 with potential lead plumbing, especially where young children live.
Do single-family homes need to comply?
Local Law 31 mainly targets multi-unit dwellings. However, water testing is still recommended for any older property.
How long does lead testing take?
Sample collection usually takes under 30 minutes. Lab results are typically available within a few days.
Can a filter solve a lead problem?
Certified lead-removal filters can reduce lead levels, but permanent solutions may involve pipe or fixture replacement.
Final Thoughts
Local Law 31 is an important step toward reducing lead exposure in New York City buildings. For landlords, co-op boards, and property managers, compliance is not only a legal obligation but also a responsibility to protect tenant health.
Because lead contamination often comes from internal plumbing, professional water testing is the most reliable way to confirm safety and meet regulatory requirements. Regular testing, proper documentation, and prompt corrective action help ensure safe drinking water for everyone in the building.