Fix library · Records citation

30 TAC §290.121: water system monitoring plan

Every public water system keeps an up-to-date written monitoring plan. It shows where samples are taken, how often, how they are tested and by which labs. A system that does not keep it current commits a monitoring violation.

What the rule says

Quoted word for word from the Texas Administrative Code, Title 30, as published by the Texas Secretary of State. Read on 10/30/2026.

30 TAC §290.121(a)

(a) Applicability. All public water systems shall maintain an up-to-date chemical and microbiological monitoring plan. Monitoring plans are subject to the review and approval of the executive director. A copy of the monitoring plan must be maintained at each water treatment plant and at a central location.

30 TAC §290.121(b)(2)

(2) The monitoring plan must include a written description of sampling frequency and schedule. (A) The monitoring plan must include a list of all routine samples required on a daily, weekly, monthly, quarterly, annual, or less frequent basis and identify the sampling location where the samples will be collected. (B) The system must maintain a current record of the sampling schedule.

30 TAC §290.121(d)(2)

(2) A public water system that fails to maintain an up-to-date monitoring plan commits a monitoring violation.

Full text: 30 TAC §290.121 (Monitoring Plans)

What proof usually looks like

Your letter sets what to show and by when. Match each item on it to records like these:

• A current written monitoring plan.
• A list of every routine sample (daily, weekly, monthly, quarterly, yearly or less often) and where each is taken.
• A current record of the sampling schedule.
• The labs and test methods you use.

Common mistakes

• A plan written years ago and never updated after changes to the system.
• Sample sites listed that no longer exist.
• No written sampling schedule.
• The plan kept off site, where the operator cannot find it.

Got a letter that cites this rule?

NOV Fixer rebuilds the paperwork: a plain-words read of your letter, the logs and forms filled in from your records, a cover letter for you to sign, and a dated checklist of what proves the fix.

Enter the code from your letter

No code? Write to [email protected].

This page explains a rule in plain words. It is not legal advice. When this page and the rule differ, the rule controls.