Study Links Tap Water Disinfection Byproducts to Higher Uterine Cancer Risk
A long‑term observational cohort of 53,100 California teachers and administrators was followed from 1995‑1996 through the end of 2020. During the follow‑up 1,038 women developed uterine cancer. The analysis found that women living in areas with the highest long‑term exposure to total trihalomethanes (THMs) — chemicals formed when chlorine disinfects water — had an overall uterine cancer risk about 18 % higher than those with lower exposure. Within the THM group, chloroform showed the strongest association with endometrioid tumors, which represent the majority of uterine cancers. Separate exposure to haloacetic acids (HAAs) was linked to nearly double the risk of the rarer, more aggressive non‑endometrioid tumors. No significant association was observed for other measured water contaminants such as nitrate, arsenic, or uranium. The study was published in JAMA Network Open and highlighted that while water disinfection remains essential for public health, the resulting by‑products may be a modifiable risk factor for uterine cancer, the most common gynecologic cancer in the United States, with higher mortality observed among Black women.
Entities: California Teachers Study · Haloacetic acids (HAAs) · JAMA Network Open · Medical Xpress · Trihalomethanes (THMs) · Uterine cancer
Claims
What the coverage asserts, and how well corroborated each claim is across sources.
- [● 3 SOURCES] Women with the highest exposure to trihalomethanes (THMs) had an overall uterine cancer risk about 18 % higher than those with lower exposure. (All three articles)
- [● 3 SOURCES] Higher exposure to haloacetic acids (HAAs) was linked to nearly double the risk of non‑endometrioid uterine tumors. (All three articles)
- [● 3 SOURCES] 1,038 women in the cohort developed uterine cancer during the follow‑up. (All three articles)
- [● 3 SOURCES] Chloroform, a specific THM, showed the strongest association with endometrioid uterine tumors. (All three articles)
- [● 3 SOURCES] The study followed a cohort of 53,100 California teachers and administrators for nearly 20 years, from 1995‑1996 to 2020. (All three articles)
- [● 3 SOURCES] The study emphasizes that the observed links are associations, not proof of causation. (All three articles)
- [○ 1 SOURCE] No significant association was found between uterine cancer risk and exposure to nitrate, arsenic, or uranium in drinking water. (English article (US))
- [● 3 SOURCES] Uterine cancer is the most common gynecologic cancer in the United States and its incidence is rising. (all)
- [● 3 SOURCES] No significant association was found between nitrate, arsenic, or uranium exposure and uterine cancer risk. (all)
- [● 3 SOURCES] Chloroform showed the strongest link to endometrioid uterine tumors. (all)
- [● 3 SOURCES] During follow‑up, 1,038 participants developed uterine cancer. (all)
- [● 3 SOURCES] Black women have higher mortality and are more often diagnosed at later stages of uterine cancer. (all)