North Tustin · Orange County · tap water report
North Tustin tap water grades A: 0 over the legal limit, 0 above the health guideline. Plain-English report and a free home water test.
Grade A: Passing grade. Every measured chemical sits well inside the safe range.
| Chemical | Measured | Legal limit | Verdict |
|---|---|---|---|
| Total Dissolved Solids (TDS) | 555 mg/L | 1000 mg/L (taste standard) | Caution (taste standard) |
| Hardness (as CaCO3) | 268 mg/L (15.7 grains per gallon) | no health limit | Very hard |
| Electrical Conductivity | 895 µS/cm | 1600 µS/cm (taste standard) | Caution (taste standard) |
| Total Dissolved Solids (TDS) | 590 mg/L | 1000 mg/L (taste standard) | Caution (taste standard) |
| Hardness (as CaCO3) | 260 mg/L (15.2 grains per gallon) | no health limit | Very hard |
| Electrical Conductivity | 860 µS/cm | 1600 µS/cm (taste standard) | Caution (taste standard) |
| Arsenic | 2.7 ppb | 10 ppb | Good |
| Nitrate | 4.1 ppm | 10 ppm | Good |
| Fluoride | 0.3 ppm | 2 ppm | Good |
| Chloride | 96 mg/L | 500 mg/L (taste standard) | Good |
| Sulfate | 53 mg/L | 500 mg/L (taste standard) | Good |
| Alkalinity (as CaCO3) | 186 mg/L | none set | Good |
| Fluoride | 0.7 ppm | 2 ppm | Good |
| Chloride | 90 mg/L | 500 mg/L (taste standard) | Good |
| Sulfate | 46 mg/L | 500 mg/L (taste standard) | Good |
| Alkalinity (as CaCO3) | 135 mg/L | none set | Good |
How to read the verdicts: Good means the measurement sits under half of the federal legal limit. Caution means it is legal but at or above half the limit, the range where health researchers advise staying lower. Too high means it exceeded the legal limit. Taste standards are EPA secondary limits for taste and appearance. Hardness uses the USGS scale, where anything over 180 mg/L counts as very hard. When a utility blends water from wells and imported supplies, the same chemical can appear twice with each source's result.
4 measured results on file across every sampling period the EPA publishes.
Golden State WC - Cowan Heights (PWSID CA3010047) has no violations in the EPA Safe Drinking Water Information System.
Every measured chemical in the latest utility tests sits well inside the safe range, and Golden State WC - Cowan Heights reports 0 health-based violations to the EPA.
Golden State WC - Cowan Heights's most recent Lead and Copper Rule result, from the 2023 to 2025 monitoring period, measured 0.0084 mg/L of lead at the 90th percentile of tested homes. The federal action level is 0.015 mg/L, so the system result sits under it. Lead usually enters water from a home's own pipes and fixtures, so a single house can differ from the system figure.
No. The EPA Safe Drinking Water Information System lists no violations for this system.
Golden State WC - Cowan Heights serves about 7,006 people in Orange County and relies mainly on surface water. It is public water system CA3010047.
Text 949-414-9944 for a free water test. A local FilteredWTR tech screens the water at your own faucet for hardness, chlorine and sediment and explains each reading while you watch. The visit is free, and afterward the decision stays yours.
A local FilteredWTR tech screens the water at your faucet for hardness, chlorine and sediment and explains each reading while you watch. The visit is free, and afterward the decision stays yours.
The fix for North Tustin water · Where North Tustin's water comes from · Whole-home water treatment explained · Orange County · All cities