Emerging Contaminant Removal

Specific techniques and materials developed to remove persistent or difficult-to-treat pollutants from water, such as per- and polyfluoroalkyl substances (PFAS), micropollutants, or specific industrial chemicals.

6,695 US filings from 2,476 companies since 2023 · 2023: 1,658 · 2024: 2,121 · 2025: 2,074 · 2026 YTD: 842

Catalysts & ReactorsWater / Sewage Treatment

Top companies

Ranked by filings in this theme since 2023. 2026 is partial.

#	Company	Since 2023	2023	2024	2025	2026 YTD	YoY
1	SAUDI ARABIAN OIL COMPANY	205	48	68	66	23	-2.9%
2	KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS	142	30	41	53	18	+29.3%
3	Halliburton Energy Services, Inc.	81	39	15	20	7	+33.3%
4	Cummins Inc.	72	10	22	31	9	+40.9%
5	Ecolab USA Inc.	59	11	20	20	8	0.0%
6	Cummins Emission Solutions Inc.	55	24	24	5	2	-79.2%
7	Imam Abdulrahman Bin Faisal University	48	17	20	9	2	-55.0%
8	Evoqua Water Technologies LLC	47	11	15	15	6	0.0%
9	BASF CORPORATION	46	14	20	10	2	-50.0%
10	CHEVRON U.S.A. INC.	43	10	12	18	3	+50.0%
11	CHAMPIONX LLC	41	2	12	19	8	+58.3%
12	IMAM MOHAMMAD IBN SAUD ISLAMIC UNIVERSITY	35	·	1	27	7	+2600.0%
13	Johnson Matthey Public Limited Company	35	11	9	12	3	+33.3%
14	ARIZONA BOARD OF REGENTS ON BEHALF OF ARIZONA STATE UNIVERSITY	33	6	9	11	7	+22.2%
15	SAMSUNG ELECTRONICS CO., LTD.	33	5	8	12	8	+50.0%
16	CALGON CARBON CORPORATION	32	3	15	10	4	-33.3%
17	THE CHEMOURS COMPANY FC, LLC	32	7	11	9	5	-18.2%
18	The Regents of the University of California	32	8	6	12	6	+100.0%
19	Battelle Memorial Institute	31	8	15	6	2	-60.0%
20	Locus Solutions IPCo, LLC	30	10	7	11	2	+57.1%
21	Baker Hughes Oilfield Operations LLC	28	7	9	10	2	+11.1%
22	Honeywell International Inc.	28	3	13	7	5	-46.2%
23	KING FAISAL UNIVERSITY	28	2	23	3	·	-87.0%
24	ENTEGRIS, INC.	27	7	10	6	4	-40.0%
25	MASSACHUSETTS INSTITUTE OF TECHNOLOGY	27	9	12	4	2	-66.7%