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Saint Johns Tap Water Quality Report
Saint Johns's water has 2 contaminants above EPA MCLGs. Consider using a certified water filter for additional protection.
Water system
ST JOHNS CITY OF
People Served
3,800
Health-based violations since 2020
0
ST JOHNS CITY OF. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Nov 2024 · ST JOHNS CITY OF
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Saint Johns 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. Saint Johns's water has 2 contaminants above EPA health-based guidelines (MCLGs), while it meets federal legal limits.
ST JOHNS CITY OF, Saint Johns's water system, serves 3,800 people. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for ST JOHNS CITY OF is from Nov 2024.
In EPA's 2023–2026 UCMR 5 testing, ST JOHNS CITY OF measured lithium at up to 16 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 Arizona
Saint Johns Water Service Areas
What these numbers actually mean for Saint Johns, AZ
We read Saint Johns, AZ’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
- 72 results on file
- 23 PFAS compounds on record
Buying a home here? Property Water Report — $49 Emailed within one business day.
Fluoride in Saint Johns's water
ST JOHNS CITY OF
PWSID AZ0401012
No fluoride level in our data for ST JOHNS CITY OF. Your utility's annual water quality report (CCR) lists it.
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Recommended Water Filters for Saint Johns
Based on Saint Johns's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA MCLGs.
Solventum Purification Inc.
3MRO401
NSF Certified:
Daily Production
11.48 gpd
Highlights:
- NSF-58 certified reverse osmosis system
- 11.48 GPD production capacity
- Reduces total dissolved solids (TDS) for purer water
Removes 15 contaminants:
+10 more
Copper, Cryptosporidium, Fluoride, Lead, Radium 226, Radium 228, Radium, combined (-226 & -228), Selenium, Total Dissolved Solids, Turbidity
Solventum Purification Inc.
3MRO301
NSF Certified:
Daily Production
11.48 gpd
Highlights:
- NSF-58 certified reverse osmosis system
- 11.48 GPD production capacity
- Reduces total dissolved solids (TDS) for purer water
Removes 15 contaminants:
+10 more
Copper, Cryptosporidium, Fluoride, Lead, Radium 226, Radium 228, Radium, combined (-226 & -228), Selenium, Total Dissolved Solids, Turbidity
AquaTru
Classic
NSF Certified:
Flow Rate
0.04 gpm
Daily Production
600 gpd
Highlights:
- Best overall contaminant reduction score
- Most performance certifications
- Lifetime warranty
- NSF-42, NSF-53, NSF-58, NSF-401 certified
Removes 23 contaminants:
+18 more
Molybdenum, Barium, Chlorine, Arsenic, 83+ contaminants, Calcium, Chloride, Copper, Magnesium, Nitrate, Phosphorus, Sodium, Sulfate, Total Dissolved Solids, Zinc, Total THMs, Chloroform, Nitrate (as N)
AquaTru
Carafe
NSF Certified:
Flow Rate
0.3 gpm
Daily Production
4 gpd
Highlights:
- Verified PFAS reduction
- Glass collection vessel
- Plug-and-play installation
- NSF-53, NSF-42, NSF-58, NSF-401, NSF-372 certified
Removes 17 contaminants:
+12 more
Arsenic, 83+ contaminants, Copper, Total THMs, Chloroform, Chloride, Sulfate, Nitrate (as N), Molybdenum, Barium, Strontium, Uranium
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 Saint Johns's water readings can explain
We publish a city-level hardness figure for Saint Johns, resolved from its water systems where they report one and estimated from county sampling where they do not. Each page starts with the hot-tap and cold-tap check, then shows what your own water system reported.
On a private well near Saint Johns? Public-water results do not apply to private wells. See Apache County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Saint Johns
Saint Johns's tap water has an estimated 4.0 grains per gallon (69.0 mg/L, county sampling in Apache County) — moderately hard on the USGS scale, below the range where scale is usually worth treating.
Water softener cost for an estimated 4.0 gpg water in Saint Johns — equipment and local installation labour for your ZIP code, with the sizing arithmetic shown in full. For the national picture first, read what a water softener costs — equipment, installation labour and ten-year ownership, each separated out. For Arizona as a whole, read water softener cost in Arizona — priced against the plumber wage published for the state.
Frequently Asked Questions About Saint Johns Tap Water
Saint Johns'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 ST JOHNS CITY OF. For a problem with your water now (discolored water, no water, low pressure, a leak), contact ST JOHNS CITY OF directly.
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