Professional ethics across Canadian regulators places the public interest (including environmental protection) above loyalty to an employer. When a professional becomes aware of non-compliance that may endanger the public or environment, the NPPE approach is to take timely, responsible steps to have the matter addressed—starting with internal notification and corrective action where effective. Option D best reflects this: inform management of regulatory obligations, document concerns, and work toward a solution that returns effluent to compliant limits. Option A is wrong because the duty to the public overrides employer preference. Option B may be appropriate later if the professional cannot ethically remain or if continued involvement creates personal exposure, but resignation alone does not address ongoing harm and is not usually the initial, most effective step. Option C is premature and problematic: disclosure to media can breach confidentiality and may not follow required reporting pathways. If management refuses to act or there is imminent risk, escalation to appropriate regulators (and any legally required reporting) becomes necessary, but the initial step is to push for internal compliance and remediation.