Mississippi splits your certificate by agency: MSDH grades drinking water A through E, MDEQ grades wastewater by treatment type and flow, and the two never overlap.
Being a contract operator means carrying responsible charge for systems you don't own, on rules that change at every state line. This page holds what this state actually requires, cited to the current rule text and dated. If you're earlier in the journey, start with the guides below.
Mississippi splits certification between two agencies. The Department of Health (MSDH), through its Bureau of Public Water Supply, certifies drinking water operators. The Department of Environmental Quality (MDEQ) certifies wastewater operators. Both work from the same law, the 1992 Municipal and Domestic Water and Wastewater System Operator's Certification Act, and use similar rule language, but they grade operators on different scales.
Drinking water has five classes, E through A. The class depends on what the plant actually does to the water, not how big it is. Class E is distribution only, no treatment. Class D adds chlorination or fluoridation. Class C adds aeration and pressure filtration. Class B adds iron and manganese removal or membrane treatment. Class A covers surface water, lime softening, or coagulation and filtration for anything beyond iron and manganese (11 Miss. Admin. Code Pt. 20, Subpart 72, Ch. 2, Rule 2.2.1).
Wastewater has six classes, based on flow and treatment type. They run from I-C, collection only, under 1.0 million gallons a day, up to Class IV, a trickling filter over 3.0 MGD or activated sludge over 2.0 MGD (11 Miss. Admin. Code Pt. 6, Ch. 3, Rule 3.3). Either way, your certificate has to match or beat the class of the system you're running.
Source: 11 Miss. Admin. Code Pt. 20, Subpart 72, Ch. 2, Rule 2.2.1 (drinking water) and 11 Miss. Admin. Code Pt. 6, Ch. 3, Rule 3.3 (wastewater), verified 2026-07-16.
On the drinking water side, Mississippi uses a specific term: "Responsible Charge." That's the certified operator, at or above the system's class, who the owner officially puts in charge of every daily decision, from treatment to distribution (Rule 2.1.2.12). If a system hires a private company to run its water system, the owner can let that company name its own employee as the operator in responsible charge (Rule 2.2.1).
Wastewater doesn't use a capitalized term. MDEQ's rules just say "certified operators in charge of wastewater facilities" (Rule 3.5) and define "Operator" as the person who directly runs the facility and is personally responsible for daily operation (Rule 3.2.G). Same job, described more plainly. Neither code sets up a separate form to name a wastewater operator, beyond telling MDEQ if you lose one.
Source: 11 Miss. Admin. Code Pt. 20, Subpart 72, Ch. 2, Rule 2.1.2.12 (drinking water) and 11 Miss. Admin. Code Pt. 6, Ch. 3, Rule 3.5 (wastewater), verified 2026-07-16.
Mississippi splits DW and WW operator certification between two different agencies (MSDH/Bureau of Public Water Supply for DW; MDEQ for WW) under a SHARED statutory umbrella, the Municipal and Domestic Water and Wastewater System Operator's Certification Act of 1992 (Miss. Code Ann. §§21-27-201 et seq., building on the 1986/1987 predecessor act), with near-identical implementing rule LANGUAGE (both admin codes use nearly the same 50-mile residence clause, the same 180-day temporary-loss-of-operator provision, and parallel definitions), even though the two admin codes live in different Titles (15 for MSDH, 11 for MDEQ) and are promulgated by different bodies (MS State Board of Health vs. MS Commission on Environmental Quality).
Neither agency requires you to file the contract itself. For drinking water, the operator in responsible charge gets named every year on the Public Water Supply Annual Report, which both the operator and the water system's responsible official sign (Rule 2.7.1.1). Both codes require you to notify the agency right away if you temporarily lose your certified operator. After that notice, the system can keep running for up to 180 days before you need to file a written request showing good cause (Rule 2.1.3.4, Rule 3.1.D). We didn't find any similar standing filing requirement on the wastewater side.
Source: Rule 2.7.1.1 and Rule 2.1.3.4 (drinking water), and Rule 3.1.D (wastewater), verified 2026-07-16.
Mississippi doesn't cap how many systems one operator can be responsible for, for either drinking water or wastewater. We checked both admin codes in full and found nothing. The only distance rule on the books is about where the operator lives, not how many systems they can run: primary residence within 50 miles of the system, waivable in writing (more on this below). One thing does run the other way: the Director can let a system carry more than one operator in responsible charge under special circumstances, but nothing limits how many systems a single operator can hold.
Wastewater has a simple visit schedule: one day a week for Class I, two for Class II, three for Class III, five for Class IV, unless the facility's discharge permit says otherwise (Rule 3.5.A). Written visit records have to be on hand for MDEQ to check.
Drinking water skips the visit count and uses a different standard: being reachable. Class A surface water systems need the certified operator on-site the whole time the plant is running, no exceptions (Rule 2.2.1.5). Classes B through E just need the operator in responsible charge, or someone they designate, "available" by phone or pager 24 hours a day (Rule 2.1.2.1). That leaves real room for remote coverage on B through E systems between problems, though the rule is written as a contact duty, not a stated allowance for remote monitoring systems (SCADA). Either way, the operator has to live within 50 miles of the system, and on drinking water must show up in person for state sanitary inspections given 24 hours' notice, unless the agency waives it.
Source: Rule 3.5.A, Rule 2.2.1.5, and Rule 2.1.2.1, verified 2026-07-16.
Mississippi certifies individual people, not companies. Neither code requires bonding, insurance, or business registration to run a contract-operator business. The only business-facing rule we found is procedural: when a water system hires a private company to operate it, the owner can let that company name its own employee as the operator in responsible charge (Rule 2.2.1). There's no equivalent rule on the wastewater side.
Source: 11 Miss. Admin. Code Pt. 20, Subpart 72, Ch. 2, Rule 2.2.1, verified 2026-07-16.
Most states don't make liability insurance a condition of holding a license. Carry it anyway. EPA's operator hiring guide puts it on the short list of questions every board should ask a contract operator: do you have liability insurance, and does it name the utility?
The reason is simple. You are making calls that affect public drinking water on systems you don't own. If something goes wrong, an uninsured operator puts the board's whole trust in you on the line, and boards that have been burned know to ask. Showing up to the first conversation with coverage in hand, and the certificate to prove it, closes the question before it opens. Talk to an insurance agent who handles utility contractors; policies that name each system you serve are the norm in this business.
Every system you operate on one map, with the records, work orders, and compliance schedule your crew actually uses. We run our own contract operation on it, so the demo is the real thing, not a sandbox.
Mississippi splits authority between two agencies. Confirm current rule text with MSDH's Bureau of Public Water Supply for drinking water, and MDEQ for wastewater, before you sign anything.
Rules change. Check the current text before you commit.
Mississippi State Dept. of Health: Bureau of Public Water Supply