Physical & aggregate
Total Dissolved Solids in U.S. tap water
119 public water systems across 21 U.S. states report Total Dissolved Solids in their annual Consumer Confidence Report. 22 sit at or above the federal limit.
What it is
Total dissolved solids — the combined content of all dissolved minerals and salts.
Why it's regulated
Regulated only as a secondary (cosmetic) standard; high levels affect taste and hardness.
At or above the federal limit (22)
| Water system | Measured | vs. limit |
|---|---|---|
| Ventura, CA 2023 annual report | 1376 mg/L | 1376.0× the limit |
| Torrance, CA 2024 annual report | 170–1100 mg/L | 1100.0× the limit |
| St George, UT 2024 annual report | 118–936 mg/L | 936.0× the limit |
| Oxnard, CA 2024 annual report | 680 mg/L | 680.0× the limit |
| Costa Mesa, CA 2024 annual report | 632 mg/L | 632.0× the limit |
| Fullerton, CA 2024 annual report | 632 mg/L | 632.0× the limit |
| Pomona, CA 2024 annual report | 573–632 mg/L | 632.0× the limit |
| Santa Ana, CA 2024 annual report | 621 mg/L | 621.0× the limit |
| Irvine, CA 2023 annual report | 612 mg/L | 612.0× the limit |
| College Station, TX 2024 annual report | 557 mg/L | 557.0× the limit |
| Huntington Beach, CA 2025 annual report | 545 mg/L | 545.0× the limit |
| Inglewood, CA 2023 annual report | 545 mg/L | 545.0× the limit |
| El Monte, CA 2024 annual report | 270–500 mg/L | 500.0× the limit |
| El Cajon, CA 2024 annual report | 483 mg/L | 483.0× the limit |
| Burbank, CA 2024 annual report | 291–470 mg/L | 470.0× the limit |
| Ontario, CA 2024 annual report | 372 mg/L | 372.0× the limit |
| Rialto, CA 2024 annual report | 322 mg/L | 322.0× the limit |
| West Covina, CA 2024 annual report | 253 mg/L | 253.0× the limit |
| Vallejo, CA 2024 annual report | 228 mg/L | 228.0× the limit |
| Fontana, CA 2024 annual report | 219.5 mg/L | 219.5× the limit |
| Hayward, CA 2024 annual report | 97 mg/L | 97.0× the limit |
| Phoenix, AZ 2025 annual report | 464–716 mg/L | 1.4× the limit |
Approaching the limit (16)
| Water system | Measured | vs. limit |
|---|---|---|
| Philadelphia, PA 2023 annual report | 216–471 | 0.9× the limit |
| Brownsville, TX 2024 annual report | 910 | 0.9× the limit |
| Glendale, CA 2024 annual report | 865 mg/L | 0.9× the limit |
| Overland Park, KS 2023 annual report | 430 | 0.9× the limit |
| City of Hemet, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| City of Menifee, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| City of Murrieta, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| City of Perris, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| City of San Jacinto, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| City of Temecula, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| East Valley Service Area, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| Mills Service Area, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| Moreno Valley, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| Skinner Service Area, CA 2024 annual report | 826 mg/L | 0.8× the limit |
| Allentown, PA 2024 annual report | 412.5 mg/L | 0.8× the limit |
| Lubbock, TX 2024 annual report | 811 mg/L | 0.8× the limit |
Within the federal limit (73)
| Water system | Measured |
|---|---|
| Billings, MT 2024 annual report | 102–354 mg/L |
| Lees Summit, MO 2025 annual report | 340 mg/L |
| Tracy, CA 2024 annual report | 668 mg/L |
| Columbia, MO 2024 annual report | 329 mg/L |
| Independence, MO 2024 annual report | 322 mg/L |
| Columbus, OH 2025 annual report | 313 |
| Cambridge, MA 2024 annual report | 300 mg/L |
| San Diego, CA 2023 annual report | 571 mg/L |
| Salinas, CA 2024 annual report | 513 mg/L |
| Escondido, CA 2024 annual report | 498 mg/L |
| Pasadena, CA 2023 annual report | 469 mg/L |
| Thousand Oaks, CA 2024 annual report | 410–450 mg/L |
| Salt Lake City, UT 2024 annual report | 244–888 |
| Huntsville, AL 2024 annual report | 118–217 mg/L |
| Simi Valley, CA 2024 annual report | 430 mg/L |
| Sunnyvale, CA 2024 annual report | 427 mg/L |
| Vacaville, CA 2024 annual report | 373 mg/L |
| Cleveland, OH 2024 annual report | 180 |
| Santa Rosa, CA 2024 annual report | 340–360 mg/L |
| Sugar Land, TX 2024 annual report | 345 mg/L |
| Nashville, TN 2023 annual report | 119–172 |
| Green Bay, WI 2024 annual report | 170 mg/L |
| Arvada, CO 2024 annual report | 132 mg/L |
| Suffolk, VA 2024 annual report | 120 mg/L |
| Round Rock, TX 2024 annual report | 239 mg/L |
| Fairfield, CA 2024 annual report | 226 mg/L |
| Chico, CA 2024 annual report | 219 mg/L |
| Charleston, SC 2024 annual report | 101 mg/L |
| North Charleston, SC 2024 annual report | 101 mg/L |
| West Valley City, UT 2024 annual report | 381 mg/L |
| Mobile, AL 2024 annual report | 90 |
| Catoosa Utility District Authority, TN 2025 annual report | 85 mg/L |
| Chattanooga, TN 2025 annual report | 85 mg/L |
| East Ridge, TN 2025 annual report | 85 mg/L |
| Elder Mountain, TN 2025 annual report | 85 mg/L |
| Fort Oglethorpe, TN 2025 annual report | 85 mg/L |
| Hesperia, CA 2024 annual report | 170 mg/L |
| Lookout Mountain, TN 2025 annual report | 85 mg/L |
| Lookout Mountain, Ga, TN 2025 annual report | 85 mg/L |
| Red Bank, TN 2025 annual report | 85 mg/L |
| Rossville, TN 2025 annual report | 85 mg/L |
| Signal Mountain, TN 2025 annual report | 85 mg/L |
| Victorville, CA 2024 annual report | 170 mg/L |
| Walker County, TN 2025 annual report | 85 mg/L |
| Visalia, CA 2024 annual report | 151 mg/L |
| West Jordan, UT 2024 annual report | 291.8 mg/L |
| Alameda, CA 2024 annual report | 65 mg/L |
| Albany, CA 2024 annual report | 65 mg/L |
| Berkeley, CA 2024 annual report | 65 mg/L |
| Castro Valley, CA 2024 annual report | 65 mg/L |
Showing 50 of 73. The full list is in the JSON API.
Frequently asked
+What is Total Dissolved Solids?
Total dissolved solids — the combined content of all dissolved minerals and salts. Regulated only as a secondary (cosmetic) standard; high levels affect taste and hardness.
+What is the federal limit for Total Dissolved Solids in drinking water?
The federal MCL for Total Dissolved Solids is 500 mg/L. The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have Total Dissolved Solids over the federal limit?
22 of the 119 public water systems on The Water Map report Total Dissolved Solids at or above its federal limit, spanning 21 U.S. states. The full list is on this page.
+How can I check if Total Dissolved Solids is in my city's tap water?
Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including Total Dissolved Solids.