{"schemaVersion":2,"id":"nl-0397","communeId":"0397","name":"Heemstede","slug":"heemstede-0397","country":"nl","region":"Noord-Holland","supplier":"Waternet","networks":[{"code":"waternet-leiduin","name":"Productielocatie Leiduin"},{"code":"waternet-weesperkarspel","name":"Productielocatie Weesperkarspel"}],"latestSampleDate":"2026-03-31","conformity":{"conclusion":null,"bacteriological":"unknown","chemical":"unknown"},"source":{"name":"Waternet, Drinkwater wettelijk te meten stoffen, jaar 2025 en 1e kwartaal 2026","url":"https://www.waternet.nl/siteassets/ons-water/drinkwater/waterkwaliteit-rapporten/2025/drinkwater-leiduin-wettelijk-2025-jaar.pdf","license":"Bron: Waternet (gemeente Amsterdam), Drinkwater productielocatie Leiduin, wettelijk te meten stoffen, jaar 2025 (geen open licentie, overgenomen met bronvermelding); Bron: Waternet (gemeente Amsterdam), Drinkwater productielocatie Weesperkarspel, wettelijk te meten stoffen, jaar 2025 (geen open licentie, overgenomen met bronvermelding)","kind":"open_data_file","verified":true,"retrievedAt":"2026-09-28T12:14:04.201Z","note":"Jaargemiddelden 2025 per productielocatie uit Waternets rapporten \"Wettelijk te meten stoffen\" (PDF, Het Waterlaboratorium), ng/l omgerekend naar µg/L. Waternet publiceert geen PFAS-4-som; de PFAS-4-waarde is de optelling van de gepubliceerde sommen van lineaire en vertakte isomeren (LB, lower bound: niet aangetoond telt als 0) van PFOA, PFOS, PFNA en PFHxS. De som van 20 is Waternets \"som 20-EU PFAS LB\"; de MB-variant (middle bound) en de jaarmaxima staan in de tabel. Leiduin en Weesperkarspel leveren beide aan het hele voorzieningsgebied; welke locatie uw kraan bedient, publiceert Waternet niet. Voor Heemstede zijn 2 locaties bekend (Productielocatie Leiduin, Productielocatie Weesperkarspel). De PFAS-waarde van de pagina komt van Productielocatie Leiduin, de locatie met de hoogste PFAS-4-waarde; de overige locaties staan in de tabel. Volgende update: Waternet publiceert kwartaalrapporten ongeveer drie maanden na het kwartaal en het jaarrapport in het voorjaar van het volgende jaar."},"pfas":{"status":"measured","sum20":{"value":0.02,"valueText":"0,02","unit":"µg/L","limit":0.1,"limitUnit":"µg/L","status":"ok","sampleDate":"2025-12-31"},"pfas4":{"value":0.00441,"valueText":"0,00441","unit":"µg/L","limit":0.004,"limitUnit":"µg/L","status":"exceeded","sampleDate":"2025-12-31"},"pfas4DetectedCount":3,"lowerBound":true,"sampledAt":null,"qualifiers":[{"name":"11Cl-PF3OUdS","valueText":"<0,001","unit":"µg/L"},{"name":"4:2 FTS","valueText":"<0,0002","unit":"µg/L"},{"name":"6:2 FTS","valueText":"<0,0005","unit":"µg/L"},{"name":"8:2 diPAP","valueText":"<0,001","unit":"µg/L"},{"name":"8:2 FTS","valueText":"<0,0002","unit":"µg/L"},{"name":"8:2 FTUCA","valueText":"<0,001","unit":"µg/L"},{"name":"9Cl-PF3ONS","valueText":"<0,0002","unit":"µg/L"},{"name":"DONA","valueText":"<0,0002","unit":"µg/L"},{"name":"FBSA","valueText":"<0,0005","unit":"µg/L"},{"name":"FHxSA","valueText":"<0,0005","unit":"µg/L"},{"name":"FOSA","valueText":"<0,0002","unit":"µg/L"},{"name":"HFPO-DA","valueText":"<0,0002","unit":"µg/L"},{"name":"N-EtFOSAA (L+B)","valueText":"<0,0002","unit":"µg/L"},{"name":"N-MeFOSAA (L+B)","valueText":"<0,0002","unit":"µg/L"},{"name":"PFDA","valueText":"<0,0005","unit":"µg/L"},{"name":"PFDoA","valueText":"<0,0005","unit":"µg/L"},{"name":"PFDoS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFDS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFHpS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFHxDA","valueText":"<0,002","unit":"µg/L"},{"name":"PFNA","valueText":"<0,0005","unit":"µg/L"},{"name":"PFNS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFPeS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFTeDA","valueText":"<0,001","unit":"µg/L"},{"name":"PFTrDA","valueText":"<0,001","unit":"µg/L"},{"name":"PFTrDS","valueText":"<0,002","unit":"µg/L"},{"name":"PFUdA","valueText":"<0,0005","unit":"µg/L"},{"name":"PFUdS","valueText":"<0,0002","unit":"µg/L"}],"comparison":{"proposed":{"value":0.0005,"period":"annual_mean","official":false,"state":"over"},"sweden":{"value":0.004,"jurisdiction":"se"},"franceSum20":{"value":0.1,"jurisdiction":"fr"}}},"samples":[{"id":"headline:nl-0397:2025-12-31","date":"2025-12-31","sourceUrl":"https://www.waternet.nl/siteassets/ons-water/drinkwater/waterkwaliteit-rapporten/2025/drinkwater-leiduin-wettelijk-2025-jaar.pdf","commune":"0397","communeName":"Heemstede","networks":["waternet-leiduin"],"sum20":{"value":0.02,"valueText":"0,02","unit":"µg/L","nonDetect":false,"lowerBound":false},"pfas4":{"value":0.00441,"valueText":"0,00441","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"11Cl-PF3OUdS","valueText":"<0,001","unit":"µg/L"},{"name":"4:2 FTS","valueText":"<0,0002","unit":"µg/L"},{"name":"6:2 FTS","valueText":"<0,0005","unit":"µg/L"},{"name":"8:2 diPAP","valueText":"<0,001","unit":"µg/L"},{"name":"8:2 FTS","valueText":"<0,0002","unit":"µg/L"},{"name":"8:2 FTUCA","valueText":"<0,001","unit":"µg/L"},{"name":"9Cl-PF3ONS","valueText":"<0,0002","unit":"µg/L"},{"name":"DONA","valueText":"<0,0002","unit":"µg/L"},{"name":"FBSA","valueText":"<0,0005","unit":"µg/L"},{"name":"FHxSA","valueText":"<0,0005","unit":"µg/L"},{"name":"FOSA","valueText":"<0,0002","unit":"µg/L"},{"name":"HFPO-DA","valueText":"<0,0002","unit":"µg/L"},{"name":"N-EtFOSAA (L+B)","valueText":"<0,0002","unit":"µg/L"},{"name":"N-MeFOSAA (L+B)","valueText":"<0,0002","unit":"µg/L"},{"name":"PFDA","valueText":"<0,0005","unit":"µg/L"},{"name":"PFDoA","valueText":"<0,0005","unit":"µg/L"},{"name":"PFDoS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFDS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFHpS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFHxDA","valueText":"<0,002","unit":"µg/L"},{"name":"PFNA","valueText":"<0,0005","unit":"µg/L"},{"name":"PFNS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFPeS","valueText":"<0,0002","unit":"µg/L"},{"name":"PFTeDA","valueText":"<0,001","unit":"µg/L"},{"name":"PFTrDA","valueText":"<0,001","unit":"µg/L"},{"name":"PFTrDS","valueText":"<0,002","unit":"µg/L"},{"name":"PFUdA","valueText":"<0,0005","unit":"µg/L"},{"name":"PFUdS","valueText":"<0,0002","unit":"µg/L"}]},"revision":"72a0c09adba60dd71e452b82422a6b62a73a0cf3c44cc80b21ad1ee3af1b3688"}],"revision":"7a79b140663dde5f0f877284d896a2dd5ed680b4c6728e3b0c729729183e1dfd"}