North Tustin Tap Water Quality Report
North Tustin's water has 2 contaminants above EPA MCLGs. Consider using a certified water filter for additional protection.
Other systems listed for North Tustin with results above guidelines: EAST ORANGE COUNTY WD - RZ (1 above guidelines), CITY OF TUSTIN (1 above guidelines)
Water system
GOLDEN STATE WC - COWAN HEIGHTS
2 other systems are listed for North Tustin. See their figures
People Served
6,986
Health-based violations since 2020
0
GOLDEN STATE WC - COWAN HEIGHTS. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Sep 2025 · GOLDEN STATE WC - COWAN HEIGHTS
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is North Tustin Tap Water Safe to Drink?
We recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems. North Tustin's water has 2 contaminants above EPA health-based guidelines (MCLGs), while it meets federal legal limits.
GOLDEN STATE WC - COWAN HEIGHTS, North Tustin's water system, serves 6,986 people. 2 other systems are listed for North Tustin. Each system's results are listed under its own name, never added to GOLDEN STATE WC - COWAN HEIGHTS's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for GOLDEN STATE WC - COWAN HEIGHTS is from Sep 2025.
In EPA's 2023–2026 UCMR 5 testing, GOLDEN STATE WC - COWAN HEIGHTS measured lithium at up to 58.9 µg/L, which EPA counts as above its health reference level of 10 µg/L. That level is a screening value EPA uses to decide what to study further, not a legal limit, and this result does not change this page's water-quality summary.
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in California
North Tustin Water Service Areas
What these numbers actually mean for North Tustin, CA
We read North Tustin, CA’s published record and send you a short report — which findings warrant a decision, which to ignore, and what to do about it. Including when the answer is nothing.
- 2 contaminants above EPA MCLGs
- 35 results on file
- 23 PFAS compounds on record
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Recommended Water Filters for North Tustin
Based on North Tustin's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
Culligan
ZeroWater
NSF Certified:
Flow Rate
1.9 gpm
Daily Production
1 gpd
Highlights:
- Compact design
- Easy to set up
- Affordable
- NSF-42, NSF-53, NSF-401 certified
Removes 19 contaminants:
+14 more
Strontium, Molybdenum, Fluoride, Uranium, Lead, Total PFAS, Chlorine, 25, Phosphorus, Bicarbonate, Calcium, Carbonate, Magnesium, Sodium
Santevia
Bath Filter
NSF Certified:
Flow Rate
0.36 gpm
Highlights:
- Organic cotton design reduces plastic used in construction
- Affordable upfront & ongoing cost
- The only bath filter that removed 100% chlorine with “normal” faster faucet flow
Removes 1 contaminants:
Waterdrop
A1
NSF Certified:
Flow Rate
1 gpm
Highlights:
- Performance certified
- Lower price than Philips
- Hot water dispensing
- Compact design
Removes 5 contaminants:
Whirlpool Corporation
W11256135
NSF Certified:
Capacity
1001 gal
Filter Life
3 mo
Flow Rate
0.7 gpm
Removes 19 contaminants:
+14 more
Benzene, Carbofuran, Chlorine (Free), Chlorine (Total), Chlorine Dioxide, Chlorobenzene, Cryptosporidium, Ethylbenzene, Lead, Mercury, Metolachlor, Tetrachloroethylene, Toxaphene, Turbidity
Test Your Water Quality
Professional laboratory testing provides accurate, detailed analysis of your drinking water.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
Tap Score
Haloacetic Acids (HAA9) Test
$275
Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
What North Tustin's water readings can explain
Utility-reported data for North Tustin includes a chlorine-based disinfectant — the readings behind these common tap water questions. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near North Tustin? Public-water results do not apply to private wells. See Orange County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Frequently Asked Questions About North Tustin Tap Water
North Tustin's water has 2 contaminants above EPA MCLGs. While the water meets federal legal limits, we recommend using a certified water filter for additional protection, especially for vulnerable populations like children, pregnant women, and those with compromised immune systems.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach GOLDEN STATE WC - COWAN HEIGHTS. For a problem with your water now (discolored water, no water, low pressure, a leak), contact GOLDEN STATE WC - COWAN HEIGHTS directly.
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