Arroyo Grande Tap Water Quality Report
Arroyo Grande's water has 2 contaminants above EPA MCLGs and 2 above EPA's legal limit (MCL, enforceable from April 26, 2029). We recommend using a certified water filter.
Other systems listed for Arroyo Grande with results above guidelines: COUNTRY HILLS ESTATES (1 above guidelines), CANYON CREST MUTUAL BENEFIT WC (1 above guidelines)
Water system
ARROYO GRANDE, WATER DEPARTMENT
5 other systems are listed for Arroyo Grande. See their figures
People Served
17,963
Health-based violations since 2020
0
ARROYO GRANDE, WATER DEPARTMENT. EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Latest sample on file
Sep 2024 · ARROYO GRANDE, WATER DEPARTMENT
Utilities publish newer results in their annual water quality report (Consumer Confidence Report).
Is Arroyo Grande Tap Water Safe to Drink?
We strongly recommend using a certified water filter to reduce exposure: Arroyo Grande's water has 4 contaminants above EPA health-based guidelines. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Arroyo Grande's water.
ARROYO GRANDE, WATER DEPARTMENT, Arroyo Grande's water system, serves 17,963 people. 5 other systems are listed for Arroyo Grande. Each system's results are listed under its own name, never added to ARROYO GRANDE, WATER DEPARTMENT's. Water quality testing is conducted regularly and reported to the EPA. The latest sample on file for ARROYO GRANDE, WATER DEPARTMENT is from Sep 2024.
In EPA's 2023–2026 UCMR 5 testing, ARROYO GRANDE, WATER DEPARTMENT measured lithium at up to 60 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
Arroyo Grande Water Service Areas
What these numbers actually mean for Arroyo Grande, CA
We read Arroyo Grande, 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 and 2 above EPA's legal limit (MCL, enforceable from April 26, 2029) and 1 nitrate reading above 10 mg/L whose basis is unconfirmed (above EPA's limit if measured as nitrogen, within it if measured as nitrate)
- 37 results on file
- 23 PFAS compounds on record
Buying a home here? Property Water Report — $49 Emailed within one business day.
Fluoride in Arroyo Grande's water
The 5 largest of the 6 water systems serving Arroyo Grande, by population served.
ARROYO GRANDE, WATER DEPARTMENT
PWSID CA4010001
No fluoride level in our data for ARROYO GRANDE, WATER DEPARTMENT. Your utility's annual water quality report (CCR) lists it.
MESA DUNES MOBILE HOME ESTATES
PWSID CA4000650
No fluoride level in our data for MESA DUNES MOBILE HOME ESTATES. Your utility's annual water quality report (CCR) lists it.
CANYON CREST MUTUAL BENEFIT WC
PWSID CA4000230
No fluoride level in our data for CANYON CREST MUTUAL BENEFIT WC. Your utility's annual water quality report (CCR) lists it.
COUNTRY HILLS ESTATES
PWSID CA4000637
COUNTRY HILLS ESTATES reported 0.84 mg/L, at or above the 0.7 mg/L U.S. Public Health Service recommendation and below the 1.5 mg/L WHO guideline value and NTP neurodevelopment review level.
RANCHO NIPOMO WATER COMPANY
PWSID CA4000771
No fluoride level in our data for RANCHO NIPOMO WATER COMPANY. Your utility's annual water quality report (CCR) lists it.
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Recommended Water Filters for Arroyo Grande
Based on Arroyo Grande's water quality data, these NSF-certified filters are recommended to remove contaminants above EPA's health goals (MCLGs) or legal limits (MCL).
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
Filters for what Arroyo Grande reported
Verify Your Water Quality with Independent Testing
With 2 contaminants above EPA MCLGs and 2 above EPA's legal limit (MCL, enforceable from April 26, 2029) and 1 nitrate reading above 10 mg/L whose basis is unconfirmed (above EPA's limit if measured as nitrogen, within it if measured as nitrate), independent laboratory testing provides a second opinion and can track changes over time.
SimpleLab
Advanced Home Water Test
$269
Comprehensive water analysis testing over 200 contaminants including bacteria, heavy metals, and chemical compounds.
Tap Score
PFAS Forever Chemicals Test
$339.95
Specialized test for PFOA, PFOS, and 24 other forever chemicals. Essential for areas near military bases, airports, or industrial sites.
Tap Score
Advanced Microplastics Test
$829
Cutting-edge testing for microplastics particles in drinking water using advanced laboratory techniques.
With 4 contaminants above health guidelines, you may want to explore water purification options. Learn how to make distilled water at home for applications like humidifiers, CPAP machines, and baby formula.
What Arroyo Grande's water readings can explain
Utility-reported data for Arroyo Grande includes a chlorine-based disinfectant — the readings behind these common tap water questions. We publish a city-level hardness figure for Arroyo Grande, 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 Arroyo Grande? Public-water results do not apply to private wells. See San Luis Obispo County well water testing and USGS risk data — modeled arsenic, nitrate, and the tests to run.
Water softener cost and installation in Arroyo Grande
Arroyo Grande's tap water measures 18.2 grains per gallon (311.0 mg/L) — very hard on the USGS scale, the range where scale on fixtures and appliances is the usual complaint.
Water softener cost for 18.2 gpg water in Arroyo Grande — 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 California as a whole, read water softener cost in California — priced against the plumber wage published for the state.
Frequently Asked Questions About Arroyo Grande Tap Water
Arroyo Grande's water has 2 contaminants above EPA MCLGs and 2 above EPA's legal limit (MCL, enforceable from April 26, 2029). We strongly recommend using a certified water filter to reduce exposure to these contaminants. Check our filter recommendations below for NSF-certified options that can remove the specific contaminants found in Arroyo Grande's water.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach ARROYO GRANDE, WATER DEPARTMENT. For a problem with your water now (discolored water, no water, low pressure, a leak), contact ARROYO GRANDE, WATER DEPARTMENT directly.
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