New Delhi, Jan. 23 -- The Capital's water crisis worsened on Thursday with six of its nine major water treatment plants were rendered either non-functional or operating at a fraction of their capacity. The failure has left swathes of Delhi - particularly in the city' s north, northwest, west, southwest and central regions - with dry taps and threatens shortages that could extend into early February. The crisis stems from two concurrent issues: dangerously high levels of ammonia in the Yamuna have forced two critical plants to halt operations, while simultaneous repair work on the Munak Canal in Haryana has drastically reduced the raw water supply to four other facilities. Only three plants - fed by the Upper Ganga Canal from Uttar Pradesh - currently remain fully operational. The Delhi Jal Board (DJB) on Thursday confirmed the complete shutdown of the Wazirabad Water Treatment Plant (WTP) -- the city's largest facility. Officials explained that ammonia spikes in the Yamuna are a chronic winter issue. A DJB official said that the supply from Ganga are being rationalised in an attempt to reduce the impact, but officials familiar with the matter said that the deficit is too large to fully offset. The Delhi government has written to the Haryana government, requesting an increased release of water from the Hathini Kund barrage to help dilute the ammonia in the Yamuna....