Sanitation & Physical Plant
21 CFR Part 111 Subpart C (§§111.15–111.35) is the supplement-cGMP rule for the physical plant, grounds, sanitation, pest control, water supply, employee hygiene, and equipment that the entire manufacturing operation sits on top of.
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It is the foundation Part 111 floor — without compliant sanitation and a controlled physical plant, every downstream specification, identity test, and label reconciliation is built on sand.
On this page · 10 sections
- 1What Subpart C covers
- 2Physical plant and grounds (§111.15)
- 3Sanitation regime (§§111.16, 111.20)
- 4Pest control (§111.25)
- 5Water supply (§111.23)
- 6Equipment and utensils (§111.27)
- 7Automated, mechanical, electronic equipment (§111.30)
- 8Personnel cleanliness and hygiene (§111.35)
- 9Five 483 / Warning-Letter patterns
- 10How V5 Ultimate handles Subpart C
How does Sanitation & Physical Plant apply to your shop floor?
Pick your industry and scale — Ask V5 rewrites the definition in your context, gives a worked example, and shows what V5 does on day one.
01What Subpart C covers
Subpart C is the foundation-floor of Part 111. Where Subparts E–H describe what to do in the manufacturing operation, Subpart C describes the operation's habitat: the building (§111.15), the sanitation regime (§111.16), the day-to-day plant operations (§111.20), the water supply (§111.23), pest control (§111.25), the equipment (§111.27), the validation of automated systems (§111.30), and the personnel-hygiene framework (§111.35). An FDA inspection typically opens with a Subpart C walk-through; a failed walk-through often pre-determines the rest of the findings.
02Physical plant and grounds (§111.15)
§111.15 requires the physical plant and grounds to be suitable for the operation. Specific provisions:
- Grounds free of litter, waste, refuse, and pest harbourage; properly drained; with access roads maintained.
- Adequate space for orderly placement of equipment and storage of components, materials, and finished supplements.
- Floors, walls, ceilings constructed so they can be adequately cleaned and kept clean.
- Adequate lighting in all areas; light bulbs in production zones are shatter-resistant or shielded.
- Adequate ventilation, with filtered air where required to prevent contamination.
- Plumbing of adequate size and design; backflow prevention to potable water systems; no cross-connection between sewage and product-contact water.
- Sewage disposal that does not contaminate the water supply or the production environment.
- Toilet facilities, hand-washing stations, and locker areas separate from production zones.
- Rubbish and offal disposal that does not contaminate or attract pests.
03Sanitation regime (§§111.16, 111.20)
Sanitation is operationalised through written SSOPs (Sanitation Standard Operating Procedures) covering: cleaning frequency per zone, cleaning agents and concentrations, application methods, contact times, rinse requirements, monitoring (visual + ATP swab + microbial), corrective actions when monitoring fails, and the cleaning verification before line restart. Common operational implementation:
- Pre-operational sanitation: 4–8 hour cycle every shift change or product change.
- Operational sanitation: spot cleaning during the run for spills and visible debris.
- Post-operational sanitation: end-of-run deep clean with documented checklist.
- Periodic deep sanitation: weekly, monthly, quarterly across different zones (overhead, drains, conveyors, dust collectors).
- ATP swab monitoring on product-contact surfaces post-cleaning, with documented limits and corrective actions.
- Microbial monitoring (settle plates, surface contact plates) per environmental-monitoring program.
04Pest control (§111.25)
§111.25 requires effective measures to exclude pests from the physical plant and to protect against contamination of components, dietary supplements, packaging, and contact surfaces. Components of a compliant program:
- Written pest-control program, typically operated by a licensed third-party (Orkin, Ecolab, Rentokil).
- Service frequency: weekly or bi-weekly inspections, monthly summary reports.
- Monitoring devices: rodent bait stations (exterior perimeter only — never inside production), insect light traps, pheromone traps for stored-product insects (Indianmeal moth, cigarette beetle).
- Trend analysis: catch counts by station over time, identifying hot spots that require facility correction.
- Pesticide use restrictions: no general-purpose application in production zones; only targeted use of approved compounds with documentation.
- Corrective actions on any pest finding inside the facility; root-cause investigation if findings escalate.
05Water supply (§111.23)
§111.23 requires water that contacts components or supplement-contact surfaces to be safe and of adequate sanitary quality. For potable water, EPA Safe Drinking Water Act standards (40 CFR Part 141) are the floor. For water used as an ingredient in the supplement (e.g. liquid supplements, syrups), the water must meet additional quality criteria — typically purified water USP <1231> or higher grade. Water systems must be designed to prevent stagnation, with annual or semi-annual sampling for chemical and microbial parameters.
06Equipment and utensils (§111.27)
§111.27 requires equipment used in manufacturing, packaging, labelling, holding, or controlling dietary supplements to be:
- Of appropriate design, construction, and workmanship for its intended use.
- Made of material that does not react with, add to, or absorb from components or dietary supplements (food-grade stainless steel 316L, food-grade polymers).
- Cleanable to the established sanitary standard — accessible, non-porous, free of crevices and dead legs.
- Calibrated where measurement accuracy affects identity, purity, strength, or composition (scales, balances, thermometers, pressure gauges, pH meters) — with §111.30 documentation of as-found / as-left calibration records.
- Maintained to a written preventive-maintenance program; PM records retained per §111.605.
- Designated as 'in-service' or 'out-of-service' with visible status tags; out-of-service equipment cannot be used until repaired and re-qualified.
07Automated, mechanical, electronic equipment (§111.30)
§111.30 extends the equipment requirements to automated systems — MES, weighing systems, automatic dosing systems, laboratory information systems, ERP integrations. Requirements:
- Designed and constructed appropriately for the intended use.
- Routinely calibrated, inspected, and checked, as appropriate, against an established written program.
- Validated where the system controls a process or generates a record that supports a regulated decision.
- Backed up so data cannot be lost; backup recovery tested.
- Maintained per a written program with documentation.
Computer-system validation under §111.30 dovetails with 21 CFR Part 11 (electronic records / signatures) for any system creating regulated records — V5 itself, batch-record systems, LIMS, e-signature platforms.
08Personnel cleanliness and hygiene (§111.35)
§111.35 sets the personnel-hygiene standard:
- Hand-washing on entry to production, after restroom use, after any contamination event.
- Outer garments suitable to protect the supplement (smocks, hairnets, beard covers, gloves, footwear covers).
- No jewellery, watches, or loose items that could fall into product.
- No food, drink, gum, tobacco, or personal medication in production zones.
- Workers with communicable illness excluded from any product-contact role.
- Visitor and contractor entry under the same hygiene controls.
09Five 483 / Warning-Letter patterns
- Stored-product insect findings in component warehouse with no trending data — §111.25 finding.
- Equipment with crevices/dead-legs that cannot be cleaned to the established standard — §111.27 finding.
- Scales used in dispensing without calibration records — §111.27 / §111.30 finding.
- Hand-wash stations missing or non-functional in production zones — §111.15 / §111.35 finding.
- Computer system controlling weighing or batch records without §111.30 validation — combined §111.30 + 21 CFR Part 11 finding.
10How V5 Ultimate handles Subpart C
- sanitation_schedules table with frequency (pre-op | operational | post-op | periodic), SSOP doc-id, last-executed, next-due.
- equipment_master with calibration_due, pm_due, validated_for (process), status (in-service | out-of-service); out-of-service equipment blocked from WO assignment.
- environmental_monitoring data ingestion (ATP, settle plates, surface contact plates) with auto-NCR on excursion.
- pest_control_visits table with consignee findings, trap counts, trending dashboard.
- §111.30 CSV evidence pack auto-generated: APP_VERSION snapshot, audit-trail completeness, backup-restore test log, IQ/OQ scripts.
- Personnel hygiene training tied to training-record gate at kiosk login.
Frequently asked questions
Q.Are SSOPs required under Part 111?+
Sanitation Standard Operating Procedures are not named verbatim in §111.16, but §111.16 + §111.20 + §111.8 collectively require written sanitation procedures with executed records. SSOPs are the practical implementation FDA inspectors look for.
Q.Can I run an in-house pest-control program?+
Yes — but the program must meet §111.25 and is held to the same standard as a third-party program. Most supplement firms outsource because licensure, pesticide handling, and trending overhead are easier under a third-party contract.
Q.Does §111.30 require validation of every spreadsheet I use?+
Any computerised system that controls a process or generates a regulated record must be appropriately validated. A spreadsheet that captures dispense weights and prints them onto the BPR is subject to §111.30 and 21 CFR Part 11 — design out the spreadsheet, or formally validate it.
Q.What is the difference between Part 111 sanitation and FSMA Part 117 sanitation?+
Part 117 (PCHF) and Part 111 sanitation both require written procedures, monitoring, and corrective actions. Part 117 has the additional sanitation-preventive-control element under §117.135(c)(3). Many co-mfg sites operate under both rules; the Part 111 SSOP layered on top of a Part 117 sanitation preventive control is the standard architecture.
Q.Where do hand-washing facilities have to be?+
§111.15 + §111.35 require hand-washing stations at locations convenient to the production areas, with running water at suitable temperature, with single-service towels or air dryers, with cleanser, and with waste receptacles. The norm is at every production-zone entry point.
Q.How often must equipment be calibrated?+
§111.27(c) requires calibration at a frequency adequate to maintain accuracy. Industry norms: scales used in dispensing — daily verification, quarterly full calibration; thermometers — quarterly; pH meters — daily prior to use; balances — per manufacturer + USP <41> minimum-weight check.
Primary sources
Further reading
- 21 CFR Part 111The full supplement cGMP framework.
- SSOPSanitation Standard Operating Procedures — the operational form Subpart C takes.
- Cleaning ValidationHow equipment cleaning is proven to remove residues to a defined limit.
- Environmental MonitoringThe microbial-monitoring program that supports the sanitation claim.
- CMMSHow equipment cleaning/PM/calibration cycles are managed.
Want to see how Sanitation & Physical Plant could fit into your own records and workflows? Explore the related V5 pages or talk to our team about what applies to your operation.