Es poco probable que estas sustancias estén por encima del límite recomendado y, por lo tanto, causen algún daño, pero podrían incluirse en el informe.
| Substance | Acceptable Limit | Sources/Uses | Potential Health Effects at High Concentrations |
| Fluoride | 1.5 mg / l | traces of fluorides are present in many waters; higher concentrations are often associated with underground sources. | elevated fluoride intakes can have effects on skeletal tissues; skeletal fluorosis (with adverse changes in bone structure) may be observed when drinking-water contains 3–6 mg of fluoride per litre. |
| Chloramine | 3 mg / l | Chloramines (Mocnchloramine, Dichloramines and Trichloramine) are present both in chlorinated water and potentially as vapour above the surface of the water. | No short or long term health effects have been associated with Chloramine. The only exception is dialysis patients that should avoid chloramine entirely. |
| Cyanogen chloride | 0.3 mg / l | Cyanogen chloride may be formed as a by-product of chloramination or chlorination of water. It is also formed by the chlorination of cyanide ion present in raw water. |
On inhalation, a concentration of 2.5 mg/m3 causes irritation. Cyanogen chloride was used as a war gas in the First World War. A concentration of 120 mg/m3 was lethal. |
| Trihalomethanes (THM) | 0.08 mg / l or 80 ppb | Trihalomethanes are formed as a by-product predominantly when chlorine is used to disinfect water for drinking. Th emost common is Chloroform. | The trihalomethanes have demonstrated carcinogenic activity in laboratory animals. (Cancer Group B) |
| Haloacetic acids | 60 ug/l | Haloacetics acid are formed as a by-product predominantly when chlorine is used to disinfect water for drinking | Excessive levels can cause nervous system and liver effects. |
| Chloroform | 0.07 mg / l or 70 ppb | Part of the trihalomethanes (see above) but may be listed on it’s own. | The trihalomethanes have demonstrated carcinogenic activity in laboratory animals. (Cancer Group B) |
| Chlorite | 1 mg / l | Part of the trihalomethanes (see above) but may be listed on it’s own. | Excessive levels can cause hemolytic anemia. |
| Bromate | 10 ug / l | Part of the trihalomethanes (see above) but may be listed on it’s own. | Excessive levels causes gastrointestinal, kidney, and hearing effects. |
