House Bill 376 Is Now Law: What Changes for North Carolina's Onsite Wastewater Industry

House Bill 376 became Session Law 2026-32 when Governor Stein signed it on July 2, 2026. The law makes several changes that directly affect onsite wastewater professionals in North Carolina — a new liability insurance requirement for certified work, a formal review process for local health department rules, a revised standard for issuing Operation Permits, an expanded private verification option, and a new statutory pathway for approving advanced pretreatment systems.

Here is what changed, section by section.

New Liability Insurance Requirement for Certified Work

G.S. 90A-72(a) — Effective January 1, 2027

The one change to the certification statutes that affects practitioners is a new liability insurance requirement. G.S. 90A-72(a) now provides that no person conducting any project requiring certification under Article 5 of Chapter 90A may do so without holding sufficient general liability coverage for the project, along with any additional liability coverage that may be required for systems completed under G.S. 130A-336.1 or G.S. 130A-336.2.

An important clarification on how this works: the insurance requirement attaches to doing the work, not to holding the license. It is not a requirement to obtain or renew a certification, and inactive licensees will not be required to present proof of liability coverage in order to renew. But before beginning any project that requires certification, the coverage must be in place.

A Formal Review Process for Local Health Department Rules

G.S. 130A-335(c) and new (c3) — Effective July 2, 2026, applying to permits applied for on or after that date

Local boards of health have long had the authority to adopt wastewater rules more stringent than the state rules adopted by the Commission for Public Health. Under the prior statute, local boards were directed to use "historical experience" to establish those modifications, and the Department's role in reviewing them was minimal.

The law removes the "historical experience" language and establishes a defined review process. Under the new G.S. 130A-335(c3), when a local board of health proposes a modification or addition to the Commission's rules, the Department of Health and Human Services must now:

• Determine whether the proposed local rule is at least as stringent as the Commission's rules and necessary to protect public health
• Hold a public hearing on the proposal, with notice posted on the Department's webpage
• Make its findings available to the public before approving or denying the proposal

The intent of this change is straightforward: to ensure there is a transparent process, with an opportunity for public review and comment, before local rules that go beyond the statewide standard take effect.

The practical impact will vary by county. Counties that can demonstrate their additional requirements are necessary to protect public health and the environment should be able to move their rules through the new process. Counties that cannot justify their requirements on that basis may find those rules do not survive review.

Operation Permits Cannot Be Withheld When Conditions Are Met

G.S. 130A-337(b) — Effective July 2, 2026, applying to permits applied for on or after that date

The law revises the standard for issuing an Operation Permit. The statute now ties issuance to the installation or repair of the system in accordance with the conditions of both the Improvement Permit and the Construction Authorization, including any site modification conditions noted in either document.

Two new sentences were added to the statute:

1. A local health department shall not withhold issuance of an Operation Permit if all conditions specified in the Improvement Permit and Construction Authorization have been met and the installation complies with all applicable laws and rules.
2. Any conditions added to the Operation Permit must be consistent with the applicable rules, and those conditions are enforceable as requirements of the permit.

In short, the statute now makes clear that when a system is installed in compliance with its permits and the rules, issuance of the Operation Permit is not discretionary, and any conditions attached to it must have a basis in the rules.

Licensed Engineers Added to the Private Verification Option

G.S. 130A-337(a1) — Effective July 2, 2026, applying to permits applied for on or after that date

Since its enactment, G.S. 130A-337(a1) has allowed an applicant to contract with an Authorized On-Site Wastewater Evaluator to conduct the verifications and inspections otherwise performed by the local health department before a system is covered and placed into use.

The law expands that option. An applicant may now contract with either an AOWE certified under Article 5 of Chapter 90A or a professional engineer licensed under Chapter 89C to conduct the required verifications or inspections. The evaluator or engineer provides written verification that all conditions of the Improvement Permit and Construction Authorization have been met, including an as-built drawing meeting the standards and scale of the issuing local health department. Upon receipt of that written verification, the applicant may cover the system and place it into operation, and must submit the verification to the local health department within two business days.

Advanced Pretreatment Defined in Statute

G.S. 130A-334 — Effective July 2, 2026

The law adds new definitions to the onsite wastewater article. The most significant for practitioners is "advanced pretreatment," now defined as any biological, chemical, or physical process or system used in addition to or in place of a septic tank — including aeration, clarification, digestion, disinfection, filtration, separation, and settling. Advanced pretreatment effluent must meet treatment standards adopted by the Commission for better-than-septic-tank effluent quality, and advanced pretreatment must be part of a ground absorption system.

This definition gives advanced pretreatment a statutory footing and sets the stage for the approval pathway change discussed below.

A Mandatory Approval Pathway for Advanced Pretreatment Systems

G.S. 130A-343(g)(3) — Effective July 2, 2026, applying to applications filed on or after that date

Before this change, a manufacturer whose system had been evaluated under a nationally recognized certification body's protocol for at least two consecutive years could apply for innovative system status — but approval remained at the Department's discretion.

The law rewrites this pathway in several ways:

• It now applies specifically to advanced pretreatment systems, rather than wastewater systems generally.
• The "two consecutive years" evaluation requirement is removed.
• Approval is no longer discretionary. The Department shall approve the application and issue an innovative wastewater system approval once it verifies four things: (1) the protocol testing dataset includes a minimum of 55 influent and effluent datasets covering the applicable constituents in the Commission's rules, obtained from a testing period of at least 26 weeks with sampling conducted during all weeks; (2) the testing data complies with the applicable effluent standards in the Commission's rules; (3) the nationally recognized certification body issued its approval; and (4) the design and installation plans are consistent with that approval.
• Where a separate disinfection process or system is proposed, fecal coliform datasets are not required if the disinfection technology is approved by a nationally recognized certification body.
• The pathway does not apply to a manufacturer requesting innovative approval as both an advanced pretreatment and dispersal system.

This provision was advanced with support from some manufacturers of advanced treatment systems. The effect is to convert national third-party certification — where the testing data meets the thresholds above — into a defined, non-discretionary route to innovative approval in North Carolina. Which manufacturers or technologies will make the most use of the new pathway remains to be seen.

The Commission for Public Health is authorized to adopt temporary and permanent rules to implement this section.

Effective Dates at a Glance

As with any statutory change, the details of implementation — including any rulemaking by the Commission for Public Health — will shape how these provisions work in practice. We will continue to monitor and report on developments as they occur.