Total Haloacetic Acids (HAA5) violations in California
120 active public water systems in California had a Total Haloacetic Acids (HAA5) violation in the past three years, 6 of them in the latest quarter of EPA's data. What Total Haloacetic Acids (HAA5) is and why it matters.
Systems with a Total Haloacetic Acids (HAA5) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Bridgeport Pud Mono County |
374 | 3 | 1 | |
|
Havasu Water Company County |
361 | 11 | 4 | |
|
Washington Water District Nevada County |
330 | 3 | 1 | |
|
Pine Mountain Mutual Water Co. Mendocino County |
310 | 2 | 1 | |
|
County Service Area 7 San Mateo County |
300 | 1 | 0 | |
|
Richard A. McGee Training Center Sacramento County |
300 | 1 | 0 | |
|
Spreckels Sugar Company Imperial County |
300 | 4 | 2 | |
|
Usmc/mtn Warfare Trng Ctr Bridgeport Mono County |
300 | 1 | 0 | |
|
Pond School Water System Kern County |
250 | 2 | 1 | |
|
Ramona Oaks RV Resort San Diego County |
250 | 4 | 0 | |
|
Shanel Tribal Utility District County |
250 | 3 | 0 | |
|
Fcsa 30 EL Porvenir Fresno County |
241 | 1 | 0 | |
|
Cacheville Service Dist Yolo County |
239 | 8 | 1 | |
|
Howonquet Community(smith River) Howonquet Community · County |
220 | 5 | 0 | |
|
Cold Springs Main Cold Springs Rancheria · County |
209 | 7 | 2 | |
|
Santa Rosa Reservation County |
205 | 1 | 0 | |
|
Improvement District No. 1 Tulare County |
200 | 1 | 0 | |
|
Usn San Clemente Island San Diego County |
200 | 3 | 0 | |
|
Pauma Valley Water Company San Diego County |
185 | 5 | 2 | |
|
Nps-Wolverton Tulare County |
165 | 4 | 1 | |
|
Madera CO Md1-Hidden Lake Estates Madera County |
162 | 1 | 0 | |
|
Fairway Mutual Water CO Tulare County |
150 | 1 | 0 | |
|
Grindstone Rancheria County |
150 | 9 | 4 | |
|
Nps Death Valley, Furnace Creek Inyo County |
150 | 1 | 0 | |
|
Harris Farms Headquarters Fresno County |
140 | 2 | 1 | |
|
Madera CO SA16 Sumner Hill Madera County |
135 | 2 | 0 | |
|
San Antonio Canyon Msc San Bernardino County |
119 | 1 | 0 | |
|
Coarsegold Market Madera County |
115 | 2 | 1 | |
|
Floriston Water System Nevada County |
110 | 3 | 1 | |
|
Guatay Mutual Benefit Corporation San Diego County |
100 | 4 | 1 | |
|
Peak to Peak Mountain Charter School WS Kern County |
100 | 3 | 1 | |
|
Pit River Montgomery Creek Rancheria Montgomery Creek Rancheria · County |
90 | 11 | 0 | |
|
Sid Pleasant Hills Ranch Solano County |
89 | 1 | 0 | |
|
Fort Bidwell Reservation County |
88 | 6 | 0 | |
|
Nps Death Valley, Cow Creek/nevares Inyo County |
88 | 2 | 0 | |
|
H & J Water Company San Diego County |
86 | 1 | 0 | |
|
Mulberry Union School Imperial County |
85 | 2 | 0 | |
|
Valley Ford Water Association Sonoma County |
84 | 3 | 1 | |
|
Penn Valley Shopping Center Nevada County |
82 | 2 | 0 | |
|
Victor Valley Wastewater Reclam San Bernardino County |
80 | 2 | 0 | |
|
Tulare County Road Yard 2/3 Tulare County |
75 | 1 | 0 | |
|
Lazy S Mobile Ranch Lake County |
73 | 1 | 0 | |
|
Gsa Tecate Port of Entry San Diego County |
70 | 1 | 0 | |
|
Turner Trailer Park County |
70 | 7 | 1 | |
|
Westside Harvesting Fresno County |
69 | 1 | 0 | |
|
Toledo MHP County |
68 | 5 | 3 | |
|
Pit River XL Rancheria Pit River Tribe · County |
61 | 6 | 0 | |
|
Brandt Cattle Imperial County |
50 | 3 | 1 | |
|
Castle Mountain Mine San Bernardino County |
50 | 3 | 1 | |
|
Venture Estates Mwc San Benito County |
50 | 1 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Total Haloacetic Acids (HAA5), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Total Haloacetic Acids (HAA5) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.