What Changed in NC Septic Rules in 2024 and 2026?

On January 1, 2024, 15A NCAC 18E replaced the 15A NCAC 18A .1900 rules for onsite wastewater in North Carolina. Operation and maintenance moved from old Rule .1961 and parts of Rule .1970 into 18E Section .1300 (Rules .1301 through .1307). Table XXXII was expanded, site-level compliance criteria for advanced pretreatment were added, and Rule .0102(f) applies Section .1300 to every system, including those permitted under the old rules.

On June 1, 2026, amendments took effect in Rules .1301, .1303, .1305, and .1306. The .1301 change implements S.L. 2024-49: Type IIa is now a conventional system with 750 linear feet of trench or less, and Type IIIa is deleted. Rule .1304, which holds the Management Entity’s reporting and notice duties, and Rule .1302 show no 2026 amendment. Separately, S.L. 2026-32 amended certification and permit statutes in 2026.

Summarizes public rules as of Oct 8, 2026; not legal advice; verify with your local health department.

Do the 18E rules apply to older systems?

Rule .0102(a) says 18E does not apply to systems with a permit “issued prior to January 1, 2024, unless the DDF or wastewater strength increases.” Rule .0102(f) then states: “Notwithstanding Paragraph (a) of this Rule, all wastewater systems shall comply with Section .1300 of this Subchapter.” The NC DHHS Quick Reference Guide repeats it: “All wastewater systems shall comply with operation and maintenance in accordance with 15A NCAC 18E .1300.”

How do old .1900 citations map to 18E?

This map comes from the cross-reference table in the NC DHHS 18E Quick Reference Guide (December 2023, Version 1). It maps at the rule and paragraph level shown; it does not map each old paragraph to a specific new paragraph, so we do not.

Old 15A NCAC 18A	New 15A NCAC 18E
.1961(b), (f), (h), (i)	.1301 Operation and maintenance
.1970(m), (n), (o)	.1302 Advanced pretreatment O&M
.1961(a), (e)	.1303 Owner responsibilities
.1961(c), (f), (g), (k); .1970(n)	.1304 Management Entity responsibilities
.1961(c), (d), (j); .1970(n)	.1305 LHD responsibilities
.1958(b); .1961(l), (m)	.1306 Malfunction and repair
None (new rule)	.1307 Abandonment
.1937(i), (j)	.0205 Operation Permit
.1970(n)	.1709 Sampling
.1970(o)	.1710 Compliance criteria
.1969(o); .1970(l)	.1712 Authorized Management Entities

The guide is not fully consistent. Its narrative section says .1302 replaces “.1970(d), (e), and (f),” says .0205 also replaces .1938(h), and gives .1962 rather than .1961 as the source of .0102. We list the cross-reference table entries and flag these differences rather than choose between them.

What changed for operators in 2024?

The guide’s summaries, quoted:

• Rule .1301: “The list of systems in Table XXXII has been expanded to include system types not listed before, such as sand-lined trench, accepted, and off-site systems.” It also clarifies “what is considered to be maintenance versus a repair.”
• Rule .1302: “New criteria for when an individual site is in compliance with treatment standards have been included. Alternatively, a procedure to show compliance by mass loading has also been included.”
• Rule .1304: “This rule includes all the operator’s responsibilities.”
• Rule .1305: “The local health department may give the owner the option to contract with a private operator to perform Type IIIb and IIIh system inspections.”
• Rule .1709: “An option to only do field testing has been included” and “The requirement for influent sampling of all advanced pretreatment systems has been removed.”
• Rule .1307 (abandonment) is “a new rule that codifies OSWP’s guidance for abandoning on-site wastewater systems.”

What did the June 1, 2026 amendments change?

In Section .1300, the History Notes show “Amended Eff. June 1, 2026” for Rules .1301, .1303, .1305, and .1306. Rules .1302, .1304, and .1307 show only “Eff. January 1, 2024,” as do .0205, .1709, .1710, and .1712.

The History Notes cite session laws that directed specific changes:

• Rule .1301 cites S.L. 2024-49, s.4.39: “System Classification Type IIa shall be described as a conventional system with 750 linear feet of trench or less. System Classification Type IIIa shall be deleted.” The current Table XXXII matches.
• Rule .1305 cites s.4.40. Current Rule .1305(e): “The authorized agent shall issue a written notice of non-compliance to the owner when the wastewater system is not malfunctioning in accordance with Rule .1303(a)(2) of this Section, but non-compliant with this Subchapter, the OP, or the ATO.”
• Rule .1306 cites S.L. 2023-77, s.20 and S.L. 2024-49, s.4.41. Section 4.41 addresses best professional judgment repairs, including for systems installed before July 1, 1977.
• Rule .1303 cites S.L. 2023-77, s.19.

We could not confirm a full line-by-line comparison of the June 2026 amendments, because the pre-amendment 18E text was not reviewed for this page.

What did 2026 legislation change?

S.L. 2026-32 (HB 376) was approved July 2, 2026. Section 7(c) added to G.S. 130A-337(b) that OP conditions “are enforceable as requirements of the permit,” for permits applied for on or after that date; see Operation Permit conditions. Section 6, effective January 1, 2027, amends G.S. 90A-72, 90A-77, and 90A-78, including: “No person conducting any project requiring certification pursuant to this Article shall do so without holding sufficient general liability coverage for the project.”

The Private Compliance Inspector certification predates S.L. 2026-32. S.L. 2024-49, Section 4.4, created it effective January 1, 2025, for compliance inspections of new and repaired systems, not routine operation and maintenance. Eligibility includes “a minimum of 5 years of experience as a certified contractor, Authorized On-Site Wastewater Evaluator, subsurface operator, or a registered environmental health specialist with experience in on-site wastewater matters.”

What did not change?

Operator certification still runs through 15A NCAC 08G, which as published still cites the old rule. Rule 08G .0204(2)(g) sets ORC visits for these systems “as required by 15A NCAC 18A .1961.” See subsurface operator certification, the North Carolina overview, and free NC tools.

Sources

• 15A NCAC 18E (Subchapter E rules): http://reports.oah.state.nc.us/ncac/title%2015a%20-%20environmental%20quality/chapter%2018%20-%20environmental%20health/subchapter%20e/subchapter%20e%20rules.pdf
• NC DHHS On-Site Water Protection Branch (18E Quick Reference Guide): https://ehs.dph.ncdhhs.gov/oswp/
• S.L. 2024-49: https://www.ncleg.gov/EnactedLegislation/SessionLaws/HTML/2023-2024/SL2024-49.html
• S.L. 2026-32: https://www.ncleg.gov/EnactedLegislation/SessionLaws/HTML/2025-2026/SL2026-32.html
• 15A NCAC 08G: http://reports.oah.state.nc.us/ncac/title%2015a%20-%20environmental%20quality/chapter%2008%20-%20water%20pollution%20control%20system%20operators%20certification%20commission/subchapter%20g/subchapter%20g%20rules.pdf

Last verified: 2026-10-08. Summarizes public rules as of Oct 8, 2026; not legal advice; verify with your local health department.

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