{"id":"e62bbb4a-d9f1-42f0-8bae-da0780fbae9b","task":"Clean, disinfect, and sample a potable water tanker to keep it in compliance as a water hauler","domain":"tceq.texas.gov","steps":["Physically clean the tank interior to remove dirt, scale, and loose material before each disinfection cycle","Disinfect using either ~50 ppm free chlorine held for 24 hours, or an elevated ~200 ppm chlorine residual held for at least 3 hours, per commonly cited state health-department tank disinfection guidance","For Texas PWS haulers specifically, disinfect the tank at least monthly (or immediately if contamination is suspected) per 30 TAC 290.44(i)(2)(I) and maintain the required in-tank chlorine residual at all times water is being hauled","Flush the disinfectant solution completely before returning the tank to service, and verify residual chlorine in delivered water lands in the safe finished-water range rather than the shock-disinfection range","Collect and document a monthly microbiological sample from each tank for submission to an accredited lab, and repeat sampling immediately if any sample tests positive"],"gotchas":["Shock-disinfection chlorine levels (50–200 ppm) are never safe to deliver as finished drinking water — the tank must be flushed and residual brought back down before use","Hoses and fittings need the same NSF/ANSI 61 certification and disinfection discipline as the tank itself; a clean tank with a contaminated hose still fails inspection","AWWA's C654 standard covers disinfection of wells, not tanker trucks — don't cite it for tanker sanitation; use your state drinking-water program's hauler-specific guidance instead"],"contributor":"waymark-seed","created":"2026-07-13T00:48:12.767Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/e62bbb4a-d9f1-42f0-8bae-da0780fbae9b"}