Willow Valley, Arizona
EPCOR 2025 Water Quality Report — Willow Valley (PWS AZ0408129 and AZ0408040) covers the King Street and Lake Cimarron systems and about 1,700 connections. Hardness 45–47 grains per gallon (FAQ; 2019 unregulated tables). Chlorine residual highest running annual average 0.48 ppm on King Street (0.18–0.63) and 0.12 ppm on Lake Cimarron (0.01–0.37). No Measure S-style residential softener ban turned up.
Arizona · Salt-softener legality
- Hardness45–47 gpg
- Chlorine0.48 ppm KS / 0.12 ppm LC
- Chlorite1.09 mg/L KS / 0.65 mg/L LC
- TTHMs66 ppb KS / 65 ppb LC
- Sodium220 ppm KS / 180 ppm LC
What to do in Willow Valley
Salt-based water softener
No district prohibition on a brine drain turned up.
A salt-based softener is the thing that actually removes hardness. Size it from your grains and how much water you use, not bathroom count. It needs a drain.
Hard water. A salt softener is the box that actually removes it.
Amazon lists shipping and returns on that product page. We do not warehouse the equipment.
Also for the kitchen
Under-sink reverse osmosis
Cloud RO is an under-sink reverse osmosis system — NSF/ANSI 58, kitchen tap, not a whole-house tank. The primary button is a tagged Amazon under-sink RO listing. Cloud buy-direct and Waterdrop sit under that. Check the exact listing if PFAS is why you are shopping. A certifier-listed pitcher is the cheap first step.
Buy Cloud RO directShop Waterdrop reverse osmosisShop PFAS-listed pitchers
Some links are affiliate links. If you buy through one, we may earn a commission. That does not change the match, and it is not a medical claim.
As an Amazon Associate we earn from qualifying purchases.
Other options that still fit
Salt-free conditioner
A salt-free conditioner changes how scale sticks. It does not soften. Soap and spots stay closer to untreated. No brine line.
Whole-house carbon for chlorine
That is chlorine. A whole-house carbon filter with an NSF/ANSI 42 chlorine claim is the usual match. A softener will not take chlorine out.
Test the tap first
A homeowner kit is a start. It is not a state-certified lab. Use a certified lab when the decision is expensive.
Softener vs carbon vs under-sink RO
A sketch for Willow Valley, tied to the best match above. Not a quote.
| Box | What it does | Ballpark (estimate) |
|---|---|---|
| Salt-based softenerBest match | Removes hardness. Needs a drain. Illegal in some sewer districts. | About $800–$2,500 for a common residential unit (equipment). Installed jobs run higher. |
| Whole-house carbon | Chlorine or chloramine taste — match the listing. Does not soften. | About $400–$1,800 for a typical tank-and-head kit (equipment). |
| Under-sink reverse osmosisBest match | Kitchen tap. Check NSF/ANSI 58 if PFAS or nitrate is why you are shopping. | About $200–$600 on Amazon search; named under-sink units vary. |
These are ballpark equipment ranges, not installed quotes and not what a dealer will write on a kitchen-table sheet. Prices move. Confirm the sewer rule before you price a brine tank.
On the report
- Water utility
- EPCOR Willow Valley
- Hardness
- 45–47 grains per gallon in the FAQ. The FAQ prints “The hardness in your water ranges from 45 to 47 grains per gallon (gpg)” and classifies Soft <1, Slightly Hard 1–3.4, Moderately Hard 3.5–6.9, Hard 7–10.4, Very Hard >10.5 gpg. The unregulated tables leaving the treatment facility (year sampled 2019) print King Street 47 gpg and Lake Cimarron 45 gpg, typical source natural calcium and magnesium content. The printed range is Very Hard. 45–47 gpg is roughly four times the report’s 10.5 gpg Very Hard threshold. The report does not print hardness in ppm. We do not invent a conversion. — EPCOR 2025 Water Quality Report — Willow Valley (PWS AZ0408129 and AZ0408040)
- Disinfectant
- Chlorine residual highest running annual average King Street 0.48 ppm (range 0.18–0.63) and Lake Cimarron 0.12 ppm (range 0.01–0.37), MRDL 4.0 / MRDLG 4, 2025 distribution-system tables. Water additive used to control microbes. The FAQ says chlorine is added as a disinfectant — not chloramine. Chlorine dioxide is used as an oxidant on the leaving-plant tables (King Street 0.69 ppm, ND–0.69; Lake Cimarron 0.51 ppm, ND–0.51; MRDL 0.8). — EPCOR 2025 Water Quality Report — Willow Valley (PWS AZ0408129 and AZ0408040)
- Brine / salt to the sewer
- No district prohibition found in current research. No Willow Valley, Mohave County, or Arizona sanitation prohibition comparable to LACSD Measure S turned up in the research for the utility's report. Still ask the agency on the sewer bill — or Mohave County if you are on septic — before cutting a brine drain. Rules change by jurisdiction, not by metro-area folklore.
How to get your water tested
The report on this page is for the public water system. It is not a test of the faucet in one house. Pipes inside a house can change the water.
For a test of your own tap, use a laboratory on the Arizona Department of Health Services list of certified drinking-water labs.
If your water comes from a private well, test it once a year. A city water report does not cover a private well.
Also around here
Extra context besides the utility report and the chart above — geology, an unregulated table, or a published study. Not a second set of printed tap numbers.
- MicroplasticsWHO’s 2019 review examined studies that found microplastic particles in treated tap and bottled water in many places. That is a published-occurrence finding, not a number from this city’s water-quality report, and we do not invent a particles-per-liter count for the tap.Microplastics in drinking-water — World Health Organization
Willow Valley drinking water is EPCOR Willow Valley. The cover lists PWS AZ0408129 and PWS AZ0408040. The report covers two systems — King Street and Lake Cimarron — with tables labeled per system. It does not say which PWS ID is which, so we do not assign them. The 2025 report says EPCOR provides water service to approximately 1,700 service connections in the Willow Valley district. The source is groundwater pumped from the Lake Mohave Basin, in alluvial deposits next to the Colorado River and Lake Mohave, replenished by the Colorado River. Adeq source water assessments in 2000 (Willow Valley–King Street) and 2003 (Willow Valley–Lake Cimarron) gave both systems a low-vulnerability designation. This page is the Willow Valley district report — not Bullhead City and not a Valley-metro blend.
No Willow Valley, Mohave County, or Arizona residential self-regenerating softener ban like LACSD Measure S turned up. Ask the agency on the sewer bill before you cut a brine drain. If you are on septic, ask Mohave County. This is not a legal opinion, and it is not a statewide finding.
The FAQ prints that hardness ranges from 45 to 47 grains per gallon. It lists Soft less than 1, Slightly Hard 1 to 3.4, Moderately Hard 3.5 to 6.9, Hard 7 to 10.4, and Very Hard greater than 10.5 gpg. The unregulated tables leaving the treatment facility (year sampled 2019) print King Street 47 gpg and Lake Cimarron 45 gpg. The printed range is Very Hard. 45–47 gpg is roughly four times the report’s 10.5 gpg Very Hard line. The report does not print hardness in ppm. We do not invent a conversion.
That hardness is already high, and the leaving-plant tables already print sodium 220 ppm on King Street (2024) and 180 ppm on Lake Cimarron (2024). A salt-based softener is the box that removes hardness. It adds more sodium, and at 45–47 gpg the grain capacity and the salt used to regenerate get large. Size from the printed grains and how much water you use, not bathroom count. It needs a drain. Kitchen reverse osmosis is the drinking-water path already used on other cities if sodium or disinfection by-product taste is why you are looking at the tap.
Chlorine residual highest running annual average on the 2025 distribution tables: King Street 0.48 ppm (range 0.18–0.63); Lake Cimarron 0.12 ppm (range 0.01–0.37). MRDL 4.0 / MRDLG 4. Water additive used to control microbes. The FAQ says chlorine is added as a disinfectant. That is free chlorine, not chloramine. Chlorine dioxide is used as an oxidant on the leaving-plant tables: King Street 0.69 ppm (range ND–0.69); Lake Cimarron 0.51 ppm (range ND–0.51); MRDL 0.8. Chlorine dioxide produces chlorite.
Chlorite on the 2025 distribution tables (highest monthly average): King Street 1.09 mg/L (range ND–1.22, MCL 1.0); Lake Cimarron 0.65 mg/L (range 0.051–0.67). Leaving-plant chlorite rows print King Street 0.96 ppm (ND–0.96) and Lake Cimarron 0.95 ppm (ND–0.95). The report’s footnote ² says some infants and young children who drink water containing chlorite in excess of the MCL could experience nervous system effects; that similar effects may occur in fetuses of pregnant women who drink water containing chlorite in excess of the MCL; and that some people may experience anemia. That is the CCR’s printed note. We are not adding a medical claim. The same footnote says that on April 15, 2026, the Willow Valley King Street system had a monthly chlorite average of 1.09 mg/L, which slightly exceeded the chlorite MCL of 1.0 mg/L; that EPCOR notified customers and made operational adjustments; and that repeat samples on April 24, 2025 averaged 0.62 mg/L. Those two dates are printed as 2026 and 2025. We do not pick a year.
Also printed on the 2025 distribution tables: TTHMs highest running annual average King Street 66 ppb (range 46.8–77.7) and Lake Cimarron 65 ppb (range 50.4–71.6), MCL 80. HAA5 King Street 14.9 ppb (range 4.8–29.2) and Lake Cimarron 14.5 ppb (range 2.1–17.8), MCL 60. Fluoride 0.24 ppm on both systems (King Street year sampled 2021; Lake Cimarron 2022). Barium King Street 0.049 ppm (2021) and Lake Cimarron 0.055 ppm (2022). Lithium on the King Street UCMR row, 2024: 80.1–91.3 ppb. That row is unregulated. We do not add a health claim. Lead 90th percentile ND and copper 0.36 ppm on King Street (2023; 20 samples; 0 above the action level). Lead ND and copper 0.43 ppm on Lake Cimarron (2023; 10 samples; 0 above the action level).
PFAS leaving-the-plant table, Lake Cimarron, year sampled 2024: PFOA, PFOS, PFNA, PFHxS, and HFPO-DA/GenX ND ppt; PFBS 5.56 ppt (range 5.23–5.56); Hazard Index 0. King Street initial monitoring, 2025: non-detect (less than 2 ppt) for PFOS, PFOA, PFNA, PFHxS, HFPO-DA, and PFBS. Units as printed. EPA drinking-water standards for these substances are effective 2029. Those are printed rows, not a medical claim.
The report says EPCOR completed a lead service line inventory of the Willow Valley King Street system before the October 17, 2024 regulatory deadline: 1,497 service lines, all identified as non-lead. It also says that because of a misunderstanding of the electronic submittal process, EPCOR did not submit that inventory by the July 1, 2025 due date and submitted it on April 29, 2026.
Questions we can answer from the report
How hard is Willow Valley tap water?
45–47 grains per gallon in the FAQ. The FAQ prints “The hardness in your water ranges from 45 to 47 grains per gallon (gpg)” and classifies Soft <1, Slightly Hard 1–3.4, Moderately Hard 3.5–6.9, Hard 7–10.4, Very Hard >10.5 gpg. The unregulated tables leaving the treatment facility (year sampled 2019) print King Street 47 gpg and Lake Cimarron 45 gpg, typical source natural calcium and magnesium content. The printed range is Very Hard. 45–47 gpg is roughly four times the report’s 10.5 gpg Very Hard threshold. The report does not print hardness in ppm. We do not invent a conversion. Source: EPCOR 2025 Water Quality Report — Willow Valley (PWS AZ0408129 and AZ0408040).
Does Willow Valley use chlorine or chloramine?
Chlorine residual highest running annual average King Street 0.48 ppm (range 0.18–0.63) and Lake Cimarron 0.12 ppm (range 0.01–0.37), MRDL 4.0 / MRDLG 4, 2025 distribution-system tables. Water additive used to control microbes. The FAQ says chlorine is added as a disinfectant — not chloramine. Chlorine dioxide is used as an oxidant on the leaving-plant tables (King Street 0.69 ppm, ND–0.69; Lake Cimarron 0.51 ppm, ND–0.51; MRDL 0.8). Source: EPCOR 2025 Water Quality Report — Willow Valley (PWS AZ0408129 and AZ0408040).
Is a salt-based water softener legal in Willow Valley?
No district prohibition found. No Willow Valley, Mohave County, or Arizona sanitation prohibition comparable to LACSD Measure S turned up in the research for the utility's report. Still ask the agency on the sewer bill — or Mohave County if you are on septic — before cutting a brine drain. Rules change by jurisdiction, not by metro-area folklore. No district prohibition on a brine drain turned up. This is not a legal opinion.
What should I do about Willow Valley tap water?
Salt-based water softener. A salt-based softener is the thing that actually removes hardness. Size it from your grains and how much water you use, not bathroom count. It needs a drain. If the job is drinking water at the kitchen, under-sink reverse osmosis is the usual path. Cloud RO is the preferred Amazon listing on this site (tag tapmatch-20). We do not claim we use it.
Sources
- 2025 Water Quality Report — Willow Valley (PWS AZ0408129 and AZ0408040) — EPCOR. Accessed 2026-10-05.
- Water quality reports (Arizona) — EPCOR. Accessed 2026-10-05.
Updated October 5, 2026. Numbers here are what the utility's report or the state record printed, plus the sewer rule. No invented detections.