What Is an NSR Air Permit?
New Source Review (NSR) is a preconstruction air permitting program for new stationary sources and modifications that increase air emissions. NSR is implemented through state permitting programs approved into the State Implementation Plan (SIP).
In practice, “NSR air permit” typically refers to one of these pathways:
- Major NSR – PSD (Prevention of Significant Deterioration): For major sources/major modifications in attainment or unclassifiable areas
- Major NSR – NNSR (Nonattainment NSR): For major sources/major modifications in nonattainment areas
- Minor NSR: For sources/modifications below major thresholds (often still requires a state construction authorization)
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Texas’ most trusted environmental experts – comprehensive by design.
When Is NSR Required?
NSR applicability is commonly triggered when you are:
- Building a new facility whose potential emissions may meet major source thresholds (or applicable state minor NSR thresholds)
- Expanding or modifying an existing facility such that the project qualifies as a major modification (PSD or NNSR) or otherwise requires a construction authorization
- Managing project timelines tied to financing, acquisition, refinancing, or development, where permitting affects notice-to-proceed, equipment procurement, and commissioning
Common Texas examples include:
- New or expanded combustion turbines/engines, boilers, process heaters
- New material handling, tankage, loading racks, and coating lines
- Projects near or within nonattainment areas where ozone designations can affect the permitting pathway
ESE Partners’ Approach
“Comprehensive by Design” means ESE Partners focuses on getting the New Source Review (NSR) air permit strategy right early, helping clients avoid over-permitting, under-permitting, and late-stage redesign. Clients value our fast applicability screening, including major versus minor source determinations, PSD versus NNSR considerations, and Texas-specific authorization options. We provide practical emissions forecasting and project netting support to help develop defensible applicability determinations, along with control strategy support aligned with regulator expectations, including BACT or LAER considerations where applicable. ESE also communicates clearly with deal teams, EPCs, and operations so schedules remain credible and decision-makers understand the path forward. Our team supports projects across Houston, Dallas–Fort Worth, Austin, San Antonio, and statewide markets.
Our Process
- Project intake + emissions unit inventory (equipment list, throughput, fuels, hours, controls)
- Emissions estimates (PTE and project increase) by pollutant
- NSR applicability determination (minor NSR vs. major NSR; PSD vs. NNSR)
- Permitting pathway + schedule (modeling needs, public notice expectations, agency routing)
- Application package development (forms, calculations, supporting memo, control descriptions)
- Agency coordination through review and responses to comments
- Construction compliance planning (recordkeeping, testing, startup notifications, and permit-ready documentation)
Regulatory Framework
New Source Review (NSR) requirements are rooted in the Clean Air Act and implemented through federal regulations and state State Implementation Plan (SIP) programs. NSR is a preconstruction permitting requirement for certain new sources and modifications, meaning applicability must be evaluated before construction begins. Depending on the project location and emissions profile, a project may trigger Prevention of Significant Deterioration (PSD) requirements in attainment or unclassifiable areas, or Nonattainment New Source Review (NNSR) requirements in nonattainment areas. After construction, many projects may also intersect with Title V operating permit obligations, depending on the facility’s source status and applicable emissions thresholds.
Risks of Not Completing This Service
If NSR is missed or classified incorrectly, the consequences are often commercial and schedule-driven:
- Project delays if construction begins without the appropriate authorization
- Costly redesign if control requirements are identified late
- Diligence and lender issues when air permitting gaps are discovered during underwriting or closing
- Enforcement exposure tied to constructing or modifying without required preconstruction approval
More Environmental Compliance Services
Water Compliance
ESE’s water compliance capabilities include industrial and construction stormwater permitting, stormwater pollution prevention plan (SWPPP) preparation, SPCC planning, FRPs, RMPs, Tier II reporting, TRI reporting, AST/UST registration/permitting, wastewater permitting and reporting, onsite inspections and compliance audits, drinking water assessments, wetlands determinations, and water sourcing/acquisition planning. Our environmental compliance services keep your facilities in line with state and federal regulations.
Multimedia Compliance
ESE also provides custom-tailored, cost-effective multimedia compliance solutions to help clients manage regulatory, permitting, and internal requirements. Our multimedia environmental compliance services include compliance audits, regulatory applicability and interpretation, EHS management systems design and implementation, EHS risk assessments, compliance assurance tool design, EHS organizational strategies, best management practices/corporate EHS standards development, and other permitting, planning, and compliance support.
Industries We Serve
ESE operates in a wide range of industries, all with unique needs and regulatory obligations. We offer experts who understand the broad complexity of environmental challenges faced by today’s businesses.
Oil & Gas Operators
Environmental consulting for upstream, midstream, and downstream operations—due diligence, compliance support, and remediation strategy. ESE helps operators manage regulatory risk and maintain operational continuity in Texas.
Telecom & Data Center Developers
ESE supports telecom and data center development with due diligence, permitting support, and construction-phase compliance. We help teams identify environmental constraints early, manage site risk, and keep schedules intact.
Land Development & Redevelopment
ESE supports developers with site screening, Phase I/II ESAs, and remediation planning for redevelopment and infill projects. We help identify constraints early and reduce delays during entitlement and construction.
Why ESE Partners
ESE Partners provides Texas-focused air permitting expertise with practical, regulator-ready strategies for New Source Review (NSR) projects. Our deal-aware consulting supports developers, operators, lenders, and counsel with clear guidance that aligns permitting decisions with transaction, construction, and operational timelines. Beyond air permitting, ESE offers integrated services across environmental due diligence, compliance, remediation, natural and cultural resources, and building sciences, helping clients manage related project risks through one coordinated team. With responsive teams that can scale statewide, ESE supports both single projects and multi-site portfolios across Texas.
ESE Partners will confirm your likely NSR pathway, outline schedule drivers, and provide a proposal—so you can keep the deal moving.
Send us your equipment list (or PFD/P&IDs) and project location.
Our Environmental Compliance Projects
Construction SWPPP: Restaurant in Central Texas
ESE Partners developed a comprehensive Construction Storm Water Pollution Prevention Plan (SWPPP) to support construction of a new located in Central Texas.
EHS Compliance Support, Air Permitting, and SPCC Plans
ESE Partners conducted comprehensive environmental compliance services for multiple facilities located in South Texas, including Spill Prevention, Control, and Countermeasure (SPCC) plan development and air permitting support.
Efficient Air Permitting for New Transfer Operations
A bulk liquid storage and transfer operator sought to launch a new ethanol transloading operation involving rail-to-truck transfers using closed-loop loading.
Frequently Asked Questions About New Source Review Air Permits
What is an NSR air permit, and what are the different pathways?
New Source Review (NSR) is a preconstruction air permitting program for new stationary sources and modifications that increase air emissions, implemented through state permitting programs approved into the State Implementation Plan (SIP). In practice, “NSR air permit” typically refers to one of these pathways: Major NSR – PSD (Prevention of Significant Deterioration), for major sources/major modifications in attainment or unclassifiable areas; Major NSR – NNSR (Nonattainment NSR), for major sources/major modifications in nonattainment areas; and Minor NSR, for sources/modifications below major thresholds (which often still requires a state construction authorization). NSR is a Clean Air Act preconstruction permit program that can drive design decisions, control technology selection, and project timelines.
When is NSR permitting required?
NSR applicability is commonly triggered when you are building a new facility whose potential emissions may meet major source thresholds (or applicable state minor NSR thresholds), expanding or modifying an existing facility such that the project qualifies as a major modification (PSD or NNSR) or otherwise requires a construction authorization, or managing project timelines tied to financing, acquisition, refinancing, or development where permitting affects notice-to-proceed, equipment procurement, and commissioning. Common Texas examples include new or expanded combustion turbines/engines, boilers, and process heaters; new material handling, tankage, loading racks, and coating lines; and projects near or within nonattainment areas where ozone designations can affect the permitting pathway. Importantly, NSR is a preconstruction permitting requirement, meaning applicability must be evaluated before construction begins.
What are the risks of missing NSR or classifying it incorrectly?
If NSR is missed or classified incorrectly, the consequences are often commercial and schedule-driven, including project delays if construction begins without the appropriate authorization, costly redesign if control requirements are identified late, diligence and lender issues when air permitting gaps are discovered during underwriting or closing, and enforcement exposure tied to constructing or modifying without required preconstruction approval.
What does ESE Partners' NSR air permit process look like?
ESE Partners’ Comprehensive by Design approach focuses on getting the NSR air permit strategy right early — helping clients avoid over-permitting, under-permitting, and late-stage redesign through fast applicability screening (major vs. minor source determinations, PSD vs. NNSR considerations, and Texas-specific authorization options), practical emissions forecasting and project netting support, and control strategy support aligned with regulator expectations, including BACT or LAER considerations where applicable. The process includes: project intake and emissions unit inventory (equipment list, throughput, fuels, hours, controls); emissions estimates (PTE and project increase) by pollutant; NSR applicability determination (minor NSR vs. major NSR; PSD vs. NNSR); permitting pathway and schedule (modeling needs, public notice expectations, agency routing); application package development (forms, calculations, supporting memo, control descriptions); agency coordination through review and responses to comments; and construction compliance planning (recordkeeping, testing, startup notifications, and permit-ready documentation). After construction, many projects may also intersect with Title V operating permit obligations, depending on the facility’s source status and applicable emissions thresholds.
